ID 776

ID 785

John put $10,000.00 in a savings account at an annual interest rate of 4%. He pays 25% tax on earnings.

How much will he have in 1 year?

ID 810

In 2000, the population of a small town was 10,000 residents.

If the annual rate of increase was 1% in 2001 and -1% in 2002, what was the population at the beginning of 2003?

ID 813

ID 820

In a basketball tournament, a team must be defeated twice to be eliminated.

Eight teams participate in the tournament.

What is the largest number of games that can be played?

ID 1302

A full box with 100 matches weighs the same as two boxes with 40 matches each.

How many empty boxes weight the same as a full box?

ID 1491

The cross-section of the identical arc stones is a trapezoid with three equal sides.

Find the smallest angle of the trapezoid.

ID 1510

The diagram shows a road network.

All cars drive in one direction from A to B.

The numbers represent the maximum flow rate in vehicles per hour.

What is maximum number of cars that can drive through the network every hour?

ID 1514

I would like to rearrange the items in the six bins shown on the right to decrease the number of bins in use.

What is the smallest number of these bins that can be used?

ID 1545

ID 1598

ID 1642

To paint four solid white lines and two dashed white lines costs $999.00 per 1 kilometer.

The dashed line is 4 times less expensive than the solid line.

If we increase the number of lanes from 2 to 5 in each direction and separate them by the dashed lines, how much would the cost increase?

ID 1658

Benny Bunny starts jumping from a hole.

Every leap is two times longer than the previous one.

Does Benny have a chance to come back to the hole?

ID 1714

ID 1809

Three boys want to equally share three pancakes.

The picture shows the pancakes' diameters.

Which part of the largest pancake will one of the boys receive?

ID 1917

If 10% of the people get 90% of the total salary paid in a county, and the average salary is $50,000, what is average salary of the highest paid people?

ID 1962

What is the number of "Friday the 13^{th}" that occur in 2012 if 1^{st}January is a Sunday?

Note: April, June, September, and November each have 30 days, February has 29 days, and all the other months have 31 days.

ID 2048

A total of 321 employees work for company XYZ and two thirds of them are men.

To obtain a workforce in which one third are men, how many women should be hired?

ID 2084

ID 2163

Bob is paid $5,000 a month for his regular job.

During Summer holidays, he reviews books, gives public speeches, and earns an additional $15,000 from his second job.

What percent of his annual income does Bob earn from his second job?

ID 2178

The business of company A is 10% greater than the business of company B now.

In ten years, company B will be 50% bigger than it is now and company A will be 10% smaller than company B.

How much faster will company B be growing than company A over the course of these ten years?

ID 2183

John is going to repair his house. There are three major activities:

electrical installation takes 3 man-days;

sanitary installation takes 4 man-days; and

garden work takes 5 man-days.

His neighbor Mary agrees to participate in the project. She works two times faster, but refuses to work on the same activity with John at the same time.

What is the project duration if they work together?

ID 2184

The picture shows a simplified statement of income for company ABC in million.

How does the profit change if the revenue decreases by 10% and the expenses increase by 10%?

ID 2239

I have a rectangular piece of cheese with a round hole.

What line cuts the piece of cheese into two parts of equal weight?

ID 2245

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

How many more coins can I place into the box if its width is increased by 30%?

ID 3051

There are 135 cars in a village of 30 families.

Each family has either 4 or 5 cars.

How many families have 5 cars?

ID 3079

It costs $27 to paint a cube.

Before painting, we divide the cube into two rectangular boxes.

How much will it cost to paint these two boxes?

ID 3091

A $10 million lottery pot is divided into equal increments over 25 years. The government retains 35% of the total for taxes.

How much could the winner expect to receive after taxes each year?

ID 3092

If three students eat three apples in 40 seconds, how long will it take six students to eat 17 apples?

NOTE: They do not cut the apples into small parts.

ID 3160

John works 5-hour shifts at a call center.

He earns $5 per hour and $5 per call.

How many calls does he need to receive per shift to earn a total of exactly $500 in 5 shifts?

ID 3166

A taxi company charges $1.95 for the first mile and 50 cents for each additional mile.

What is the maximum distance someone could travel with seven dollars?

ID 3184

A bicyclist pedals downhill at 25 km/h (kilometers per hour) and uphill at 10 km/h.

It takes 2 hours to travel from a Swiss mountain village to another village.

The return trip takes 5 hours.

Find the distance between the two villages.

ID 3185

You have 27 dimes; 26 are real and one is fake.

All the real ones weigh the same, and the fake weighs less than the real ones.

How many times do you use a balance scale to find the fake dime?

ID 3194

ID 3210

A city hall floor is to be tiled in the following pattern.

The hall measures 100 x 100 tiles.

How many green tiles do we need?

ID 3309

A restaurant sells a 30 cm (in diameter) pizza for $9, while their large 40 cm pizza is specially priced at $14.

What is the percent discount the restaurant is offering for the large pizza?

ID 3334

A real estate agent receives a 5% commission on the selling price of a house from the buyer.

You can borrow 65% of the house price from your bank.

If you have $200 000, what is the most expensive house that you can afford?

ID 3335

A real estate agent receives a 5% commission on the selling price of a house from the buyer.

You can borrow 75% of the house price from your bank.

If you have $360 000, what is the most expensive house that you can afford?

ID 3454

ID 3462

In a casino on a Sunday, 90% of the visitors lost $200 each,

9% of the visitors lost $1,000 each, and

the rest won $10,000 each.

If the profit of the casino is $340,000, how many people visited the casino?

ID 3485

In a survey of customers, 2/3 of the female clients and 3/4 of the male clients preferred using antiglare display computers over glossy display computers.

Women make up 48% of the clients in the region.

What percent of the clients prefer to use antiglare display computers?

ID 3714

ID 3755

A girl begins to ascend a mountain from its base at 8:00.

She follows a track, makes stops, and arrives at the summit at 19:00.

On the next day, she begins her descent at 8:00 and follows the same track downhill to arrive back at the same place at 19:00.

Is there a spot along the track that she visited at the same time on both ways?

ID 3760

Andrew is expecting two important 10-minute phone calls today at a randomly selected time from 2:00 p.m. to 3:00 p.m.

What is the probability that he will not be able to answer the second call because he is talking with the first caller?

ID 3764

Bill is going to visit his family in New York.

He lives 105 miles away in Connecticut.

He can travel at an average speed (on departure) of 50 miles / hour (mph), which constantly decreases to 10 mph on arrival.

What time should he leave if he needs to meet his family at noon?

ID 3893

How many 1x1 squares fit into the large square with the side length 3.7?

Find the maximum possible number.

ID 3973

A group of 24 scouts goes on a trip.

They prepare enough food to last 10 days.

If 6 additional scouts join them at the last minute, how many days will their food last?

ID 3989

Water weighs 1000kg per cubic meter at 4 degrees Celsius.

Fresh snow that melts into water becomes approximately 1/10th its original volume.

Estimate the snow weight on the roof of a house if the roof width, length, and height are 9.6 meters, 10 meters, and 2 meters, respectively.

The height of the snow is 1 meter.

ID 4050

In 2013, 87.5% of Swiss train passengers arrived at their destination with no more than a three-minute delay.

If there are 8 million people live in the country and one-eighth of them take the train every day, how many passengers were late in 2013?

ID 4083

The heights of the masts from the first to the fifth are 32 m, 36 m, 35 m, 32 m, and 26 m.

They are 8 m apart.

What is the maximum distance between two neighboring tops?

ID 4107

John buys a car, paying 20% in cash.

The rest of the amount is paid by a special interest-free loan.

He pays $1,680 a month for 5 years.

Find the total amount paid for the car.

ID 4118

ID 4127

In a company all people except “shop workers” has 2 direct subordinates.

How many shop workers in the company if there are 10 levels of subordination in the company?

ID 4176

The State Tennis tournament starts with 128 players.

How many rounds must be played before a champion is found?

ID 4217

A solid metal ball weighs 9 pounds.

How much will another ball of the same metal weigh if its diameter is twice as long?

ID 4224

Items accepted by an airline must not be more than 3 x 4 x 12 ft long.

What is the largest flute can I take with me?

ID 4227

According to USDA's Economic Research the average American ate 2000 lbs of food in 2011, about 1000kg or the weight of a small car.

If the average Indian eats 5 times less than an American, how much does an Indian eat in a day?

ID 4237

The straight road of 40 km long is divided into three different parts.

The length of the middle part is 10 km.

What is the distance between the centers of the outer parts?

ID 4291

A girl caught her first fish after 30 minutes of waiting.

She caught each next fish 2 minutes faster than the previous one.

How much time does it take to catch a dozen fish?

ID 4357

Seven trees are planted in a park, with exactly 3 meters between each successive planting.

In other words the second tree is 3 m from the first tree.

The third tree is 3 m from the second tree and so on.

What is the minimum possible distance between the first and the seventh trees?

ID 4412

How long do One Thousand and One Nights last?

A Persian king, Shahryar, begins to marry a succession of girls only to execute each one the next morning. Scheherazade, the vizier's daughter, decides to be a bride. On the night of their marriage, Scheherazade begins to tell the king a tale, but does not end it. The king, curious about how the story ends, is thus forced to postpone her execution in order to hear the conclusion. The next night, as soon as she finishes the tale, she begins (and only begins) a new one, and the king, eager to hear the conclusion, postpones her execution once again. So it goes on for 1,001 nights. Source : Wikipedia

ID 4424

What is the most money you can have in $1, $2, $5, $10, $20, and $50 bills and not be able to make exact change for a $100 bill?

Source: The Little Book of Big Mind Binders by Scott Kim

ID 4426

Americans measure the temperature in ^{o}F.

Europeans measure the temperature in ^{o}C.

The formula to convert Fahrenheit to Celsius is:

c = 5 (f - 32) / 9

where / is the symbol for division,

f represents the temperature in ^{o}F and

c represents the temperature in ^{o}C.

What is the temperature at which the Celsius and Fahrenheit readings are the same?

ID 4443

The size of most credit cards is 85.60 x 53.98 mm ( 3 3/8 x 2 1/8 in ).

Estimate the area of a card.

1 cm = 10 mm

ID 4498

A very old car takes 2 hours 48 minutes to get to my granny's house, 84 km away.

How long would it take at this speed for me and Jane to go to a party in the city center tonight, 12 km away?

ID 4562

Two automobiles set off at the same time, one from Vevey and the other from Lausanne, and arrived at Geneva at the same time.

The distance between Lausanne and Geneva is twice the distance between Lausanne and Vevey.

If the first car traveled through Lausanne without stopping, how much faster was it going than the second car?

ID 4571

A driver's eyes are about 1.3 m above the ground, while the hood is 2 m in front of him and 0.8 m above the ground.

What is the minimum distance in front of the hood an object on the ground can be visible?

ID 4586

Gerry drives to Jane's house at 60 miles per hour and comes back at 40 miles per hour.

How far from Jane's house does he live if the entire trip takes 2 hours?

ID 4748

How many revolutions did the Earth make around its axis in 20^{th} century?

The 20^{th} century was a century that began on January 1, 1901 and ended on December 31, 2000. It was the tenth and final century of the 2nd millennium.

ID 4824

Ten men met at a conference.

It took 4 seconds for each man to shake hands with a guy and 3 seconds to move to another one.

How long did the procedure last?

ID 4837

There were 196 countries on the Earth in 2010.

The 2-letter codes are supplied by the ISO ( International Organization for Standardization) for each country. For example,

US - United States,

GB - United Kingdom,

AU - Australia,

. . .

How many more new countries can get a 2-letter code?

ID 4882

My bath has two taps and a plug hole.

The cold tap on its own fills the bath in 18 minutes, the hot one in 24 minutes.

The plug hole can drain the bath in 15 minutes with the taps off.

How long will the bath take to fill if I leave both taps on with the plug left out?

ID 4891

ID 4927

I picked an integer from 1 to 1000.

What is minimum number of questions, with my Yes-No answer, that are needed for you to guarantee to identify the number?

ID 5043

Jane purchased a house for $ 400,000.

She wants a Real Estate Agent to sell it for her.

The Agent must make a commission of exactly 5% in addition to Jane's 10% profit.

How much must the Agent sell the house for?

ID 5049

A short word can be written forward, backward or upside down while remaining the same word.

What is the first letter of the word?

ID 5124

ID 5228

Leslie Green asks:

"** Endocrinic Igorosis** is a horrible disease with a 100% mortality rate for the infected. Even after 5 years nobody knows how it spreads. The fatality statistics have been steady at 100 people per 100,000 of the population every year. A remarkable cure has been found which is 100% effective at curing the disease, but only if administered before any symptoms are visible. Sadly, if the cure is given to anybody who is not infected then 3% of them will die. The latest test is 100% effective at finding this awful disease, but has a false positive rate of 5%.

How do we save the greatest number of people?"

ID 5289

Gerry has $30 in pennies, nickels, dimes, and quarters with proportion:

25 : 10 : 5 : 1

How many quarters does he have?

Penny = 1 cent.

Nickel = 5 cents.

Dime = 10 cents.

Quarter = 25 cents.