A+Click : Think Outside The Box : Brainteasers


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

think MathThe number of hours left today is half of the number of hours already passed. . . .

think MathBrad has as many brothers as sisters. How many more brothers than sisters . . .

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

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

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

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

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

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

think MathFifteen numbers have an average of 15. Five of these numbers have an average . . .

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

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

think MathThe last digit of the number 333 is:

think MathHow many planes of symmetry does a cube have?

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

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

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

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

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

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

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

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

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

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

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

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

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

think MathTwo princes and two princesses are ready to marry. Everybody independently . . .

think MathWhich shape fits in the missing space to complete the pattern?

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

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

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

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

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

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

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

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

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

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

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

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

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

think MathHow many zeros are there at the end of 100! ?

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

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

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

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

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

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

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

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

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

think MathHow many seconds were in 2012?

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

think MathWhich is the sum of all digits of the decimal representation of 516 . . .

think Math2889 digits are used to number the pages of a book beginning at page 1. How . . .

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

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

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

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

think MathWhat is the largest digit in the product of 11111111 x 11111111 ?

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

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

think MathWhat is the number of "Friday the 13th" that occur in 2012 if . . .

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

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

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

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

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

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

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

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

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

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

think MathWhich gives the largest answer?

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

think MathLarge individual letters are differently priced. The letters in the word . . .

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

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

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

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

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

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

think MathWhich number comes next? 2, 12, 1112, 3112, . . . .

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

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

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

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

think MathFind a phrase that differs from the others.

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

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

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

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

think MathLogic puzzle: a secret door. A man approached the door of a secret . . .

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

think MathFind the angle between two diagonals drawn on two faces of the cube.

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

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

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

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

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

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

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

think MathFind the odd one out.

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

think MathWhat is the next letter in this series?

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

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

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

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

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

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

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

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

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

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

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

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

think MathWhich city is the odd one out?

think MathWhat word has letters that are not in alphabetical order?

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

think MathIf you rearrange the letters NAMELESS, you would have the name of a

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

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

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

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

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

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

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

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

think MathIf you rearrange the letters NAPDOL, you would have the name of a

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

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

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

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

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

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

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

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

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

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

think MathThinking outside the box: Which statement is correct?

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

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

think MathWhich number goes next? 1 3 6 10 ?

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

think MathWhat is the 100th positive integer that is not divisible by 10?

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

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

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

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

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

think MathWhat fraction of this regular octagon is shaded?

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

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

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

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

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

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

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

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

think MathWhich point cuts the rope into two equal parts?

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

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

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

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

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

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

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

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

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

think MathWhich numeral system states that 7 + 6 = 15

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

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

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

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

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

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

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

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

think MathWhat gives the largest result?

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

think MathFind the product of 111,111,111 x 111,111,111

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

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

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

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

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

think MathLen's number is 31. Jim's number is 32. Sam's number is 33. Which number . . .

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

think MathWhich number required the most paper?

think MathWhich is correct?

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

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

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

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

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

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

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

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

think MathHow many squares of all different sizes are on a chessboard?

think MathGuess!

think MathWhat is the word coiled inside this circle?

think MathWhat is the word coiled inside this circle?

think MathGuess!

think MathWhich of the following is least like the others?

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

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

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

think MathThe numbers show the areas of corresponding triangles. What is the area of . . .

think Math95.8% of James' classmates have different number of hair than he has. How . . .

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

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

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

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

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

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

think MathWhat number is largest?

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

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

think MathFind the odd one out.

think MathHow many different bracelets can make from four beads?

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

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

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

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

think MathCrazy Logic. Choose a number.

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

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

think MathWhat is half of work and one third of gentleman?

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

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

think MathWhat is missing?

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

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

think MathIf One, Nine, and Eight gives ONE what is Two, Eight, and Nine ?

think Math300 plus 150 and 300 minus X is the same thing. What is X?

think MathWhich number goes next? 1 1 2 3 5

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

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

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

think Math0.123123123123123 . . . . What fraction is it?

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

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

think Math0.999... means infinitely repeating decimals. What is the largest result?

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

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

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

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

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

think MathThere are 10 coins and 5 of them are fake. The real gold coins have the same . . .

think MathTwo gods A and B are called, in no particular order, True and Random. True . . .

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