Pattern Recognition

What is the difference between the pictures on the left and right pages? Pattern Recognition

What is the difference between the pictures on the left and right pages? Pattern Recognition

What is the difference between the pictures on the left and right pages? Pattern Recognition

What is the difference between the pictures on the left and right pages? Pattern Recognition

What is the difference between the pictures on the left and right pages?

How many letters are there in the correct answer to this question?

The number of hours left today is half of the number of hours already passed. . . .

Brad has as many brothers as sisters. How many more brothers than sisters . . .

If you write all numbers from 0 to 109, which digit (numeral) will you write . . .

The product of three consecutive whole numbers is 999,900. What is the . . .

A melon slice weighs 5kg, and 95% of the weight is from water. After lying in . . .

Four friends tried to guess the number of sheep in a flock. Alex guessed 21, . . .

Alex needs six tacks to fix two rectangular pictures because he can overlap the . . .

Five students put their sandwiches into five paper bags. The bags are randomly . . .

Fifteen numbers have an average of 15. Five of these numbers have an average . . .

Anna's income is seven-eighths that of Beatrice. Anna's expenses are . . .

How many times do the clock hands form a 90-degree angle in the course of 12 . . .

The last digit of the number 3^{33} is:

How many planes of symmetry does a cube have?

The number 99! is very big. How many zeros are there at the end of the . . .

I roll two dice. What is the probability that the second number is greater . . .

How many squares can you make using twelve identical matches without crossing?

You take half of syrup and mix it with the water, and then take the same . . .

Find the hundreds digit (third digit from the right) of the product: 44444 x . . .

The product of 2 integers is 1000. Find the smallest possible sum of these . . .

A lady, attempting to avoid revealing her real age to her husband, says: I'm . . .

It costs $24 to paint a cube, the cost being proportional to the surface area. . . .

What is the smallest integer that is 4 times the sum of its digits?

Twelve couples met at a party. Each person shook the hand of each of the . . .

What is the units digit of 1! + 2! + 3! + ... + 2011!? 4! means 1 x 2 x 3 x 4

There are four brothers in a family. The sums of the ages of three of them are . . .

The left picture shows nine dots arranged in a 3 x 3 square. The dots are . . .

Two princes and two princesses are ready to marry. Everybody independently . . .

Which shape fits in the missing space to complete the pattern?

A 4-character password uses exactly two different digits. Each digit can be 0, . . .

The picture shows a tiling pattern which is made of square green tiles 10 x 10 . . .

Which of these diagrams could be drawn without taking the pen off the page and . . .

I wrote all the numbers from 0 to 999. Which digit did I write less than the . . .

The diagram shows 15 billiard balls that fit exactly inside a triangular rack. . . .

Which of these diagrams could be drawn completely without lifting the pen off . . .

There are 10 girls and 10 boys in a class. A teacher randomly chooses two . . .

How many ways can one travel from point H to point F if moving north and west . . .

Multiply all positive two-digit numbers. How many zeros are there at the end . . .

You have four piles: three piles with real coins and one pile with fake coins. . . .

Benny Bunny starts jumping from a hole. Every leap is two times longer than . . .

How many times do the two hands of a clock point in the same direction between . . .

After a gun is fired in a saloon, 75% of the cowboys have a wounded ear, 80% . . .

How many zeros are there at the end of**100!** ?

It takes 2 cards to build 1 floor of a card house. It takes 7 cards to build . . .

I must balance any whole number load from 1kg to 40kg using these four weights . . .

Based on 20 years per generation, estimate the number of ancestors John has in . . .

What is the sum of all the digits (not numbers) in the sequence 1, 2, 3, 4, . . . . .

Two dice are thrown. Two numbers are multiplied. Which product of numbers . . .

Two cards are randomly chosen. Two numbers are added. What sum of numbers . . .

What is the average of the smaller of two random numbers from 0 to 1?

What is the average of the smaller of three random numbers from 0 to 1?

Three white hens and four black hens lay as many eggs in five days as two white . . .

How many seconds were in 2012?

A kitten has a 50/50 chance to be male or female. My cat just delivered two . . .

Which is the sum of all digits of the decimal representation of 5^{16} . . .

2889 digits are used to number the pages of a book beginning at page 1. How . . .

A jigsaw puzzle consists of 250 identical pieces to spread on a plane. A link . . .

Bob the plumber has 10 pockets and 60 nuts. He wants to put the nuts in all . . .

How many three-digit numbers which are multiples of 7 end with the digit 4?

How many three-digit numbers containing only even digits are divisible by 9?

What is the largest digit in the product of 11111111 x 11111111 ?

What is the maximum number of pieces that an apple can be divided into with . . .

What is the smallest positive integer that has 12 different positive divisors, . . .

What is the number of "Friday the 13^{th}" that occur in 2012 if . . .

What is the largest product of positive integers that add up to 17?

What is the sum of all 5-digit integers which include all five digits 1, 2, 3, . . .

What is the probability that a point chosen randomly from the interior of an . . .

A farmer puts several pigs into three pens. None of the pens is empty. All . . .

How old is the eldest sister if the product of the sisters' ages is 792?

How many integers from 1 to 100 can be written as the sum of 3 consecutive . . .

San Jose Scrabblereg; Club No. 21 published a three-letter word list that . . .

Three apples were weighed in pairs and the weights were 200, 204, and 208 . . .

Thinking outside the box: 52 - 28 = 4 Which digit has to be moved to . . .

This shape was formed by removing a small cube from a big cube. The side . . .

Which gives the largest answer?

In a city Konigsberg, there were seven bridges. There was a tradition to walk . . .

Large individual letters are differently priced. The letters in the word . . .

In a city, there were seven bridges. There was a tradition to walk and cross . . .

Four matchsticks form a square. How many non-overlapping squares can be . . .

I arranged eight wooden sticks in the shape of a fish. What is the minimum . . .

Three mentors and four apprentices produce as many devices in five days as two . . .

The date July 31, 1370 in MM/DD/YYYY format is a palindrome that may be read . . .

Guesstimation. How many tennis balls can fit in a school bus?

Which number comes next? 2, 12, 1112, 3112, . . . .

What is the maximum number of apples (ideal spherical units) that can touch . . .

How many different cubes can I make by using six different colors such that . . .

There is a legend that a stork brings babies to a village. All parents . . .

A sphere fits inside a cube. The maximum possible ratio of the volume of the . . .

Find a phrase that differs from the others.

I want to measure exactly six minutes from the moment I touch an hourglass, . . .

I want to cut a wooden cube that is five inches on each side into 125 one-inch . . .

I arranged twelve one-inch wooden sticks in a polygon with an area of 6 square . . .

You have 240 golden bricks identical in size and appearance but one is lighter . . .

Logic puzzle: a secret door. A man approached the door of a secret . . .

The difference between a two-digit number and the number obtained by . . .

Find the angle between two diagonals drawn on two faces of the cube.

I have four boxes, each containing identically shaped balls: one of them is . . .

In a bakery store, 400 customers participated in a survey on Tuesday. On . . .

An entrepreneur wants to hire the best person for a position. He makes a . . .

Logic riddle In a house, there are three switches on the ground floor for . . .

How many three-digit numbers have exactly five divisors including 1 and itself?

One hundred soldiers form a 10 x 10 square. From every column, the tallest . . .

There are 9 children in a class and each knows a different piece of a short . . .

Find the odd one out.

On average there are 100,000 strands of hair on a person's head. Hair grows . . .

What is the next letter in this series?

What is the smallest number of matchsticks you remove to make 10?

You are shrunk so that your height is equal to the diameter of a dime (a . . .

I have a rectangular piece of cheese with a round hole. What line cuts the . . .

A donkey must transport 900 carrots to the market, which is 300 miles away. . . .

Make two fractions with all the digits from 0 to 9. Use each digit once. They . . .

A magician placed 3 bowls of fruit in 3 closed boxes and 10 people tried to . . .

It takes exactly 1 hour to burn a rope when I light one of its ends. The rate . . .

I place 1000 coins in two columns in a wooden box, and they fit nicely as . . .

What is the average of the largest of N random numbers from 0 to 1?

Logic riddle: In a house, there are three switches on the ground floor and a . . .

Benny Bunny starts jumping from a hole. It takes six seconds for every 10 . . .

Six goldfish need 2/3 of a cup of fish food per week. How many fish could be . . .

Which city is the odd one out?

What word has letters that are not in alphabetical order?

Is it legal for a man in Montana to dance with his widow's sister at her . . .

If you rearrange the letters NAMELESS, you would have the name of a

Logic puzzle. Only the first and last letters of the words below are in their . . .

A pyramid and a tetrahedron with edges of the same length are glued together on . . .

"Three sailors come across a pile of coconuts. The first sailor takes half of . . .

I take half of the coconuts plus a coconut. What percentage of coconuts do I . . .

I want to measure exactly six minutes using only a five-minute hourglass and a . . .

I need 1 + 9 + 25 = 35 cubes to build a pyramid with a height of 3 cubes. . . .

If you wrote all the whole numbers from 1 through 1000, how many times would . . .

Mount Everest is the Earth's highest mountain with a peak at 8,848 meters . . .

If you rearrange the letters NAPDOL, you would have the name of a

If a square is four and a triangle is three, how many is a regular star?

I place 11 chairs along the walls in an empty rectangular room. The number of . . .

The Lucas problem. François Édouard Anatole Lucas (1842-1891) was a French . . .

A man eats 20 coconuts in 20 days. Together with his wife, they eat the same . . .

There are 12 people in a village. They have 12 coconuts altogether. Each man . . .

Vladimir Arnold (1937-2010), one of the greatest 20th century Russian . . .

Inspired by Morozkin's problem : Two children started at 6:00 and each . . .

1 gives 2 2 gives 6 3 gives 12 4 gives 20 What does 10 give?

A committee consists of 7 people. The committee keeps an important object in a . . .

Guesstimation A man can jump up to four times the length of his own body. . . .

Thinking outside the box: Which statement is correct?

Job interview logic puzzle in a bank. Which of these pieces of information . . .

Wikipedia says that the equator is about 40,075 kilometers (24,901 miles) long; . . .

Which number goes next? 1 3 6 10 ?

How many 1x1 squares fit into the large square with the side length 4.8? . . .

What is the 100^{th} positive integer that is not divisible by 10?

Anna and Bill roll a six-sided die. The first person to roll a six wins. Anna . . .

There are 190 coconuts in a basket. Sailors one after another take out half of . . .

The weights of each pair of these boxes are 98kg, 101kg, and 102kg. What is . . .

If regular stars are placed as shown to form a complete circle, how many stars . . .

In a game, Anna and Bill take 1, 2, or 3 coins on each turn. The player to . . .

What fraction of this regular octagon is shaded?

You can throw an unlimited number of darts at the dartboard. Some total . . .

How many sets of three consecutive integers whose product is equal to their sum . . .

In a city, sixty percent of the men are married to eighty percent of the women. . . .

Which year has had the greatest number of Roman numerals in it?

How many "yes or no" questions are needed to guess any 3-digit lock code?

Which result ends in exactly seven zeroes. Remember: N! = 1 x 2 x . . . x N

The product and sum of two positive integers X and Y are added together. The . . .

The wind in the open-air swimming pool increases the westward swimming speed . . .

Which point cuts the rope into two equal parts?

You roll two dice. Estimate the expected value on the highest valued die?

If John walks up an escalator at a rate of one step per second, 12 steps take . . .

Two proofreading programs, A and B, discovered 30 and 40 errors, respectively. . . .

On an island, three-quarters of the men are married to four-fifths of the . . .

After a test of a code, John detected 2 errors and Mary discovered 3 errors in . . .

If you were to spell out the numbers, how far would you have to go before . . .

A father has left 47 donkeys for you to distribute to his three sons; 1/2 . . .

Find the logic: 12345678 -> 4 234567 -> 2 3456 -> 2 45 -> X Find X.

One quarter of the competitors were faster than Mary and I, but two thirds were . . .

Which numeral system states that 7 + 6 = 15

One by one, 40 cars enter a company parking lot with 40 assigned places. The . . .

Five students Anna, Bill, Craig, Daniel, and Eugene commute by bus. Every . . .

You pay $6 to enter a game. You roll 2 dice. You then have two choices: you . . .

How many uninteresting numbers exist? The question is based on the . . .

Share $10 among boys and girls so that each girl gets $1 more than a boy. . . .

How many sets are there of three consecutive positive integers whose product . . .

If the sum of 999 positive integers is equal to 1000 what is their product?

What is the maximum possible difference between the two-digit number and the . . .

What gives the largest result?

The difference of two positive integers is equal to their average. What is . . .

Find the product of 111,111,111 x 111,111,111

The amount of water flowing into a tank doubles every minute. The tank is full . . .

A pirate boat is floating on a lake. The pirates throw a heavy chest with gold . . .

I have 33 coins. What is the minimum number of coins I need in order to make . . .

There are 5 children in a boat. Four of them do one of the activities below. . . .

The product of two integers is 1000. Neither of the numbers contains a zero. . . .

Len's number is 31. Jim's number is 32. Sam's number is 33. Which number . . .

Seven trees are planted in a park, not closer than 3 meters apart. What is the . . .

Which is a better fit? The smaller the percentage of the ‘area left over,’ . . .

Once upon a time, there were three little pigs - ages 2, 4, and 6 months. If . . .

"This is a capital letter of the alphabet that's been folded just once. Which . . .

I multiply the ages of three kids and get 48. If I add their ages, what is . . .

What is the most money you can have in $1, $2, $5, $10, $20, and $50 bills and . . .

Three overlapping squares form 5 squares including themselves in the picture. . . .

You have a large supply of 5kg and 12kg weights. Six 5kg weights and one 12kg . . .

The diagram shows the lowest point and the highest point of our planet. What . . .

A car traveling with speed 12 meters per second decelerates uniformly until it . . .

If I place a pair of brackets in to this number expression, what result can be . . .

If each coconut is priced at $9, then the shopkeeper loses $11. If each . . .

Bob used to weigh 100kg. His new stressful job causes him to lose 10% every . . .

I composed the numbers from strips of paper. Find the odd one out.

I composed the numbers from strips of paper. Find the odd one out.

Which number required the most paper?

Which is correct?

January 1st, 2014 was a Wednesday. How many Wednesdays occurred in 2014? . . .

Gerry's circular garden is 1200 m in diameter and has no fence. How far can a . . .

What is the maximum number of sections into which a pancake may be divided into . . .

How many 9s are there in the result of the multiplication: 12345 x 99999 ? . . .

How many 1s are there in the result of the multiplication: 12345 x 99999? . . .

If Gerry gives Jane one apple, they will have the same number of apples. If . . .

After an hour, Evguenia catches and frees 10 fish. If there are 100 fish in a . . .

Which regular shape cannot be used to tile a floor with no gaps between tiles?

How many squares of all different sizes are on a chessboard?

Guess!

What is the word coiled inside this circle?

What is the word coiled inside this circle?

Guess!

Which of the following is least like the others?

How many letters are there in the word that all smart students spell . . .

Three positive whole numbers have the same answer added together or when . . .

A grandmother prepared bowls of fruit for her family. The only fruits available . . .

The numbers show the areas of corresponding triangles. What is the area of . . .

95.8% of James' classmates have different number of hair than he has. How . . .

How many students are there in Evguenia's class, if 5% of the students have . . .

If you make one word using each letter below only once, what place does the . . .

John is Jim's son. Jay is John's son. John is a doctor's son. His father . . .

Gerry and Jane spent a week on an island and they ate only coconuts. Gerry . . .

What is the smallest integer that can be written with two digits?

On average there are 100,000 strands of hair on a person's head. Hair grows . . .

What number is largest?

What gives the smallest result? Here we write 0.333 . . . as notation for . . .

In a room, there are 3 bosses, 2 wives, and a plumber who works for the . . .

Find the odd one out.

How many different bracelets can make from four beads?

What is the sum of the first 100 prime numbers? A prime number is a natural . . .

Gerry's income is seven-eighths that of Jane. Gerry's expenses are . . .

The sum of 11 consecutive integer numbers is 11. What is the largest number?

The product of 33 positive integers is 33. What is the sum of the numbers?

Crazy Logic. Choose a number.

If you were to spell out the numbers, how far would you have to go before . . .

Two American coins add up to 35 cents but one of them is not a dime. What is . . .

What is half of work and one third of gentleman?

If you take one third of GOOGLE and two thirds of ATT, what do you get?

A shopkeeper of a Dairy stands six feet tall and wears size 13 sneakers. What . . .

What is missing?

Zac's number is 5. Anna's number is 6. Bill’s number is 7. What is . . .

if today is the payday in Bob’s company, what happens in two days?

If One, Nine, and Eight gives ONE what is Two, Eight, and Nine ?

300 plus 150 and 300 minus X is the same thing. What is X?

Which number goes next? 1 1 2 3 5

When Pinocchio lies, his nose gets twice as long. When he tells the truth, his . . .

What letter goes next? A E F H I K L M N

The difference between a positive integer and the sum of its digits is always . . .

0.123123123123123 . . . . What fraction is it?

You have more shoes than an average child in your country. This statement is . . .

In a room, there are 3 bosses, 2 wives, and a plumber. What is the least . . .

0.999... means infinitely repeating decimals. What is the largest result?

I add blue blocks one by one on the top. Does the structure fail?

John cuts a large piece of cheese into small pieces using straight cuts from a . . .

Two men and two women want to cross a river. The boat will only hold one man . . .

A girl walked along a level road and up a hill from home and back. Her pace . . .

A magic square is an arrangement of integers, in a square grid, where the . . .

There are 10 coins and 5 of them are fake. The real gold coins have the same . . . Think Outside The Box

Two gods A and B are called, in no particular order, True and Random. True . . . Pattern Recognition

What is the difference between the pictures on the left and right pages? Pattern Recognition

What is the difference between the pictures on the left and right pages? Pattern Recognition

What is the difference between the pictures on the left and right pages?## HOME

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What is the difference between the pictures on the left and right pages? Pattern Recognition

What is the difference between the pictures on the left and right pages? Pattern Recognition

What is the difference between the pictures on the left and right pages? Pattern Recognition

What is the difference between the pictures on the left and right pages? Pattern Recognition

What is the difference between the pictures on the left and right pages?

How many letters are there in the correct answer to this question?

The number of hours left today is half of the number of hours already passed. . . .

Brad has as many brothers as sisters. How many more brothers than sisters . . .

If you write all numbers from 0 to 109, which digit (numeral) will you write . . .

The product of three consecutive whole numbers is 999,900. What is the . . .

A melon slice weighs 5kg, and 95% of the weight is from water. After lying in . . .

Four friends tried to guess the number of sheep in a flock. Alex guessed 21, . . .

Alex needs six tacks to fix two rectangular pictures because he can overlap the . . .

Five students put their sandwiches into five paper bags. The bags are randomly . . .

Fifteen numbers have an average of 15. Five of these numbers have an average . . .

Anna's income is seven-eighths that of Beatrice. Anna's expenses are . . .

How many times do the clock hands form a 90-degree angle in the course of 12 . . .

The last digit of the number 3

How many planes of symmetry does a cube have?

The number 99! is very big. How many zeros are there at the end of the . . .

I roll two dice. What is the probability that the second number is greater . . .

How many squares can you make using twelve identical matches without crossing?

You take half of syrup and mix it with the water, and then take the same . . .

Find the hundreds digit (third digit from the right) of the product: 44444 x . . .

The product of 2 integers is 1000. Find the smallest possible sum of these . . .

A lady, attempting to avoid revealing her real age to her husband, says: I'm . . .

It costs $24 to paint a cube, the cost being proportional to the surface area. . . .

What is the smallest integer that is 4 times the sum of its digits?

Twelve couples met at a party. Each person shook the hand of each of the . . .

What is the units digit of 1! + 2! + 3! + ... + 2011!? 4! means 1 x 2 x 3 x 4

There are four brothers in a family. The sums of the ages of three of them are . . .

The left picture shows nine dots arranged in a 3 x 3 square. The dots are . . .

Two princes and two princesses are ready to marry. Everybody independently . . .

Which shape fits in the missing space to complete the pattern?

A 4-character password uses exactly two different digits. Each digit can be 0, . . .

The picture shows a tiling pattern which is made of square green tiles 10 x 10 . . .

Which of these diagrams could be drawn without taking the pen off the page and . . .

I wrote all the numbers from 0 to 999. Which digit did I write less than the . . .

The diagram shows 15 billiard balls that fit exactly inside a triangular rack. . . .

Which of these diagrams could be drawn completely without lifting the pen off . . .

There are 10 girls and 10 boys in a class. A teacher randomly chooses two . . .

How many ways can one travel from point H to point F if moving north and west . . .

Multiply all positive two-digit numbers. How many zeros are there at the end . . .

You have four piles: three piles with real coins and one pile with fake coins. . . .

Benny Bunny starts jumping from a hole. Every leap is two times longer than . . .

How many times do the two hands of a clock point in the same direction between . . .

After a gun is fired in a saloon, 75% of the cowboys have a wounded ear, 80% . . .

How many zeros are there at the end of

It takes 2 cards to build 1 floor of a card house. It takes 7 cards to build . . .

I must balance any whole number load from 1kg to 40kg using these four weights . . .

Based on 20 years per generation, estimate the number of ancestors John has in . . .

What is the sum of all the digits (not numbers) in the sequence 1, 2, 3, 4, . . . . .

Two dice are thrown. Two numbers are multiplied. Which product of numbers . . .

Two cards are randomly chosen. Two numbers are added. What sum of numbers . . .

What is the average of the smaller of two random numbers from 0 to 1?

What is the average of the smaller of three random numbers from 0 to 1?

Three white hens and four black hens lay as many eggs in five days as two white . . .

How many seconds were in 2012?

A kitten has a 50/50 chance to be male or female. My cat just delivered two . . .

Which is the sum of all digits of the decimal representation of 5

2889 digits are used to number the pages of a book beginning at page 1. How . . .

A jigsaw puzzle consists of 250 identical pieces to spread on a plane. A link . . .

Bob the plumber has 10 pockets and 60 nuts. He wants to put the nuts in all . . .

How many three-digit numbers which are multiples of 7 end with the digit 4?

How many three-digit numbers containing only even digits are divisible by 9?

What is the largest digit in the product of 11111111 x 11111111 ?

What is the maximum number of pieces that an apple can be divided into with . . .

What is the smallest positive integer that has 12 different positive divisors, . . .

What is the number of "Friday the 13

What is the largest product of positive integers that add up to 17?

What is the sum of all 5-digit integers which include all five digits 1, 2, 3, . . .

What is the probability that a point chosen randomly from the interior of an . . .

A farmer puts several pigs into three pens. None of the pens is empty. All . . .

How old is the eldest sister if the product of the sisters' ages is 792?

How many integers from 1 to 100 can be written as the sum of 3 consecutive . . .

San Jose Scrabblereg; Club No. 21 published a three-letter word list that . . .

Three apples were weighed in pairs and the weights were 200, 204, and 208 . . .

Thinking outside the box: 52 - 28 = 4 Which digit has to be moved to . . .

This shape was formed by removing a small cube from a big cube. The side . . .

Which gives the largest answer?

In a city Konigsberg, there were seven bridges. There was a tradition to walk . . .

Large individual letters are differently priced. The letters in the word . . .

In a city, there were seven bridges. There was a tradition to walk and cross . . .

Four matchsticks form a square. How many non-overlapping squares can be . . .

I arranged eight wooden sticks in the shape of a fish. What is the minimum . . .

Three mentors and four apprentices produce as many devices in five days as two . . .

The date July 31, 1370 in MM/DD/YYYY format is a palindrome that may be read . . .

Guesstimation. How many tennis balls can fit in a school bus?

Which number comes next? 2, 12, 1112, 3112, . . . .

What is the maximum number of apples (ideal spherical units) that can touch . . .

How many different cubes can I make by using six different colors such that . . .

There is a legend that a stork brings babies to a village. All parents . . .

A sphere fits inside a cube. The maximum possible ratio of the volume of the . . .

Find a phrase that differs from the others.

I want to measure exactly six minutes from the moment I touch an hourglass, . . .

I want to cut a wooden cube that is five inches on each side into 125 one-inch . . .

I arranged twelve one-inch wooden sticks in a polygon with an area of 6 square . . .

You have 240 golden bricks identical in size and appearance but one is lighter . . .

Logic puzzle: a secret door. A man approached the door of a secret . . .

The difference between a two-digit number and the number obtained by . . .

Find the angle between two diagonals drawn on two faces of the cube.

I have four boxes, each containing identically shaped balls: one of them is . . .

In a bakery store, 400 customers participated in a survey on Tuesday. On . . .

An entrepreneur wants to hire the best person for a position. He makes a . . .

Logic riddle In a house, there are three switches on the ground floor for . . .

How many three-digit numbers have exactly five divisors including 1 and itself?

One hundred soldiers form a 10 x 10 square. From every column, the tallest . . .

There are 9 children in a class and each knows a different piece of a short . . .

Find the odd one out.

On average there are 100,000 strands of hair on a person's head. Hair grows . . .

What is the next letter in this series?

What is the smallest number of matchsticks you remove to make 10?

You are shrunk so that your height is equal to the diameter of a dime (a . . .

I have a rectangular piece of cheese with a round hole. What line cuts the . . .

A donkey must transport 900 carrots to the market, which is 300 miles away. . . .

Make two fractions with all the digits from 0 to 9. Use each digit once. They . . .

A magician placed 3 bowls of fruit in 3 closed boxes and 10 people tried to . . .

It takes exactly 1 hour to burn a rope when I light one of its ends. The rate . . .

I place 1000 coins in two columns in a wooden box, and they fit nicely as . . .

What is the average of the largest of N random numbers from 0 to 1?

Logic riddle: In a house, there are three switches on the ground floor and a . . .

Benny Bunny starts jumping from a hole. It takes six seconds for every 10 . . .

Six goldfish need 2/3 of a cup of fish food per week. How many fish could be . . .

Which city is the odd one out?

What word has letters that are not in alphabetical order?

Is it legal for a man in Montana to dance with his widow's sister at her . . .

If you rearrange the letters NAMELESS, you would have the name of a

Logic puzzle. Only the first and last letters of the words below are in their . . .

A pyramid and a tetrahedron with edges of the same length are glued together on . . .

"Three sailors come across a pile of coconuts. The first sailor takes half of . . .

I take half of the coconuts plus a coconut. What percentage of coconuts do I . . .

I want to measure exactly six minutes using only a five-minute hourglass and a . . .

I need 1 + 9 + 25 = 35 cubes to build a pyramid with a height of 3 cubes. . . .

If you wrote all the whole numbers from 1 through 1000, how many times would . . .

Mount Everest is the Earth's highest mountain with a peak at 8,848 meters . . .

If you rearrange the letters NAPDOL, you would have the name of a

If a square is four and a triangle is three, how many is a regular star?

I place 11 chairs along the walls in an empty rectangular room. The number of . . .

The Lucas problem. François Édouard Anatole Lucas (1842-1891) was a French . . .

A man eats 20 coconuts in 20 days. Together with his wife, they eat the same . . .

There are 12 people in a village. They have 12 coconuts altogether. Each man . . .

Vladimir Arnold (1937-2010), one of the greatest 20th century Russian . . .

Inspired by Morozkin's problem : Two children started at 6:00 and each . . .

1 gives 2 2 gives 6 3 gives 12 4 gives 20 What does 10 give?

A committee consists of 7 people. The committee keeps an important object in a . . .

Guesstimation A man can jump up to four times the length of his own body. . . .

Thinking outside the box: Which statement is correct?

Job interview logic puzzle in a bank. Which of these pieces of information . . .

Wikipedia says that the equator is about 40,075 kilometers (24,901 miles) long; . . .

Which number goes next? 1 3 6 10 ?

How many 1x1 squares fit into the large square with the side length 4.8? . . .

What is the 100

Anna and Bill roll a six-sided die. The first person to roll a six wins. Anna . . .

There are 190 coconuts in a basket. Sailors one after another take out half of . . .

The weights of each pair of these boxes are 98kg, 101kg, and 102kg. What is . . .

If regular stars are placed as shown to form a complete circle, how many stars . . .

In a game, Anna and Bill take 1, 2, or 3 coins on each turn. The player to . . .

What fraction of this regular octagon is shaded?

You can throw an unlimited number of darts at the dartboard. Some total . . .

How many sets of three consecutive integers whose product is equal to their sum . . .

In a city, sixty percent of the men are married to eighty percent of the women. . . .

Which year has had the greatest number of Roman numerals in it?

How many "yes or no" questions are needed to guess any 3-digit lock code?

Which result ends in exactly seven zeroes. Remember: N! = 1 x 2 x . . . x N

The product and sum of two positive integers X and Y are added together. The . . .

The wind in the open-air swimming pool increases the westward swimming speed . . .

Which point cuts the rope into two equal parts?

You roll two dice. Estimate the expected value on the highest valued die?

If John walks up an escalator at a rate of one step per second, 12 steps take . . .

Two proofreading programs, A and B, discovered 30 and 40 errors, respectively. . . .

On an island, three-quarters of the men are married to four-fifths of the . . .

After a test of a code, John detected 2 errors and Mary discovered 3 errors in . . .

If you were to spell out the numbers, how far would you have to go before . . .

A father has left 47 donkeys for you to distribute to his three sons; 1/2 . . .

Find the logic: 12345678 -> 4 234567 -> 2 3456 -> 2 45 -> X Find X.

One quarter of the competitors were faster than Mary and I, but two thirds were . . .

Which numeral system states that 7 + 6 = 15

One by one, 40 cars enter a company parking lot with 40 assigned places. The . . .

Five students Anna, Bill, Craig, Daniel, and Eugene commute by bus. Every . . .

You pay $6 to enter a game. You roll 2 dice. You then have two choices: you . . .

How many uninteresting numbers exist? The question is based on the . . .

Share $10 among boys and girls so that each girl gets $1 more than a boy. . . .

How many sets are there of three consecutive positive integers whose product . . .

If the sum of 999 positive integers is equal to 1000 what is their product?

What is the maximum possible difference between the two-digit number and the . . .

What gives the largest result?

The difference of two positive integers is equal to their average. What is . . .

Find the product of 111,111,111 x 111,111,111

The amount of water flowing into a tank doubles every minute. The tank is full . . .

A pirate boat is floating on a lake. The pirates throw a heavy chest with gold . . .

I have 33 coins. What is the minimum number of coins I need in order to make . . .

There are 5 children in a boat. Four of them do one of the activities below. . . .

The product of two integers is 1000. Neither of the numbers contains a zero. . . .

Len's number is 31. Jim's number is 32. Sam's number is 33. Which number . . .

Seven trees are planted in a park, not closer than 3 meters apart. What is the . . .

Which is a better fit? The smaller the percentage of the ‘area left over,’ . . .

Once upon a time, there were three little pigs - ages 2, 4, and 6 months. If . . .

"This is a capital letter of the alphabet that's been folded just once. Which . . .

I multiply the ages of three kids and get 48. If I add their ages, what is . . .

What is the most money you can have in $1, $2, $5, $10, $20, and $50 bills and . . .

Three overlapping squares form 5 squares including themselves in the picture. . . .

You have a large supply of 5kg and 12kg weights. Six 5kg weights and one 12kg . . .

The diagram shows the lowest point and the highest point of our planet. What . . .

A car traveling with speed 12 meters per second decelerates uniformly until it . . .

If I place a pair of brackets in to this number expression, what result can be . . .

If each coconut is priced at $9, then the shopkeeper loses $11. If each . . .

Bob used to weigh 100kg. His new stressful job causes him to lose 10% every . . .

I composed the numbers from strips of paper. Find the odd one out.

I composed the numbers from strips of paper. Find the odd one out.

Which number required the most paper?

Which is correct?

January 1st, 2014 was a Wednesday. How many Wednesdays occurred in 2014? . . .

Gerry's circular garden is 1200 m in diameter and has no fence. How far can a . . .

What is the maximum number of sections into which a pancake may be divided into . . .

How many 9s are there in the result of the multiplication: 12345 x 99999 ? . . .

How many 1s are there in the result of the multiplication: 12345 x 99999? . . .

If Gerry gives Jane one apple, they will have the same number of apples. If . . .

After an hour, Evguenia catches and frees 10 fish. If there are 100 fish in a . . .

Which regular shape cannot be used to tile a floor with no gaps between tiles?

How many squares of all different sizes are on a chessboard?

Guess!

What is the word coiled inside this circle?

What is the word coiled inside this circle?

Guess!

Which of the following is least like the others?

How many letters are there in the word that all smart students spell . . .

Three positive whole numbers have the same answer added together or when . . .

A grandmother prepared bowls of fruit for her family. The only fruits available . . .

The numbers show the areas of corresponding triangles. What is the area of . . .

95.8% of James' classmates have different number of hair than he has. How . . .

How many students are there in Evguenia's class, if 5% of the students have . . .

If you make one word using each letter below only once, what place does the . . .

John is Jim's son. Jay is John's son. John is a doctor's son. His father . . .

Gerry and Jane spent a week on an island and they ate only coconuts. Gerry . . .

What is the smallest integer that can be written with two digits?

On average there are 100,000 strands of hair on a person's head. Hair grows . . .

What number is largest?

What gives the smallest result? Here we write 0.333 . . . as notation for . . .

In a room, there are 3 bosses, 2 wives, and a plumber who works for the . . .

Find the odd one out.

How many different bracelets can make from four beads?

What is the sum of the first 100 prime numbers? A prime number is a natural . . .

Gerry's income is seven-eighths that of Jane. Gerry's expenses are . . .

The sum of 11 consecutive integer numbers is 11. What is the largest number?

The product of 33 positive integers is 33. What is the sum of the numbers?

Crazy Logic. Choose a number.

If you were to spell out the numbers, how far would you have to go before . . .

Two American coins add up to 35 cents but one of them is not a dime. What is . . .

What is half of work and one third of gentleman?

If you take one third of GOOGLE and two thirds of ATT, what do you get?

A shopkeeper of a Dairy stands six feet tall and wears size 13 sneakers. What . . .

What is missing?

Zac's number is 5. Anna's number is 6. Bill’s number is 7. What is . . .

if today is the payday in Bob’s company, what happens in two days?

If One, Nine, and Eight gives ONE what is Two, Eight, and Nine ?

300 plus 150 and 300 minus X is the same thing. What is X?

Which number goes next? 1 1 2 3 5

When Pinocchio lies, his nose gets twice as long. When he tells the truth, his . . .

What letter goes next? A E F H I K L M N

The difference between a positive integer and the sum of its digits is always . . .

0.123123123123123 . . . . What fraction is it?

You have more shoes than an average child in your country. This statement is . . .

In a room, there are 3 bosses, 2 wives, and a plumber. What is the least . . .

0.999... means infinitely repeating decimals. What is the largest result?

I add blue blocks one by one on the top. Does the structure fail?

John cuts a large piece of cheese into small pieces using straight cuts from a . . .

Two men and two women want to cross a river. The boat will only hold one man . . .

A girl walked along a level road and up a hill from home and back. Her pace . . .

A magic square is an arrangement of integers, in a square grid, where the . . .

There are 10 coins and 5 of them are fake. The real gold coins have the same . . . Think Outside The Box

Two gods A and B are called, in no particular order, True and Random. True . . . Pattern Recognition

What is the difference between the pictures on the left and right pages? Pattern Recognition

What is the difference between the pictures on the left and right pages? Pattern Recognition

What is the difference between the pictures on the left and right pages?

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