How many quarters are there in 3 and a half dollars?
Tom drove his car 200 kilometers in 4 hours.
He continued to drive at double this speed.
How many hours will it take him to drive another 150 kilometers?
John paid $60 for 8 CDs.
All CDs cost the same price, but 2 of them were on sale for 25% off.
How much did each CD cost?
John is making a rectangular flower box. He is using wood that is 10 centimeters wide to make the flower box.
Which design gives the largest area for the flowers?
To complete one set of pipe installations, Bob the plumber needs the following components:
4 long pipes,
8 short pipes, and
14 fittings.
He has 66 long pipes, 55 short pipes, and 444 fittings in stock.
How many sets can Bob install?
Tim placed an order for a book.
If the order is below $40, then the minimum shipping and handling charge of $6 will apply.
If the order is higher, then the charge is 15% of the order price.
Tim's order price is $44.00.
What is the total cost of the order including shipping and handling?
Our school will have to pay $24 for 15 dozen pencils.
How much will the school have to pay for 50 dozen pencils?
The total price of an apple and a tangerine is 39 cents.
The total price of 2 apples and 3 tangerines is 99 cents.
What is the price of one apple?
A hockey team lost every fifth game and won 6 more than it lost.
There are no draws.
How many games did the team win?
If eight people can stand on a square meter of carpet, how many of them can stand in an elevator (lift) cab that is 2.1 meters by 1.2 meters and 2.2 meters high?
The left clock runs slower at a rate of 6 minutes per hour.
The second clock runs faster at a rate of 6 minutes per hour.
Both clocks start at the same time.
When will they be one hour apart?
There are 12 men on a basketball team, and in a game 5 of them play at any one time.
If the game is 48 minutes long and if each man plays exactly the same amount of time, how many minutes does each man play?
Anna earned $72.
She gives her mother 1/3 of this amount and spends 1/4 of the money on going out.
What fraction of the $72 is left?
John started a business in which he earned $1 on the first day, $5 on the second day, $9 on the third day, $13 on the fourth day, and so on.
What is his earning in day 1000?
If you would like to give a tip of 15% and you have no change, without using a calculator, how much money should you give the waiter if the check is $115?
The picture shows a supermarket bill with 22 items.
What is maximum mistake I can make, in general, if I only count integer values of the prices for any of 22 items?
I want to build a fence around a garden.
The perimeter of the garden is 12 meters.
The fence posts must be placed at every 1 meter of fence.
How many posts do I need to order?
How many different nonzero weights can you measure with a balance and three weights of 1kg, 3kg and 7kg?
The picture shows the diagram of a living room floor with four doors.
The 0.5-meter wide walls are shaded in the diagram.
What is the area of the walls?
NOTE: Do not count the doors.
A stadium security system consists of two stages.
In the first stage, 60% of the spectators are inspected.
In the second stage, 80% of the people undergo an inspection.
Estimate the maximum possible percentage of spectators who do not undergo any inspection.
The picture shows four supermarket lines viewed from above.
The numbers are estimations of the items in the shoppers' baskets.
If waiting time depends only on the number of items in the baskets, which line do you choose to be the shortest?
In 2010, the population of the Italian capital Rome was 2,761,477 and the population of the Vatican City was 846.
What is the best estimate for the Vatican citizens in the aggregate population?
A watch loses 3.5 seconds and another watch gains 2.5 seconds every 24 hours.
When will they show a difference of 10 minutes?
A hammer and a nail cost $21.
If the hammer cost $20 more than the nail, how many times is the hammer more expensive than the nail?
There are 1.58 US dollars to the UK pound.
How many dollars would you receive if you exchanged 40 pounds?
The original price of an umbrella was $20.
What was the price of the umbrella after two 40% markdowns?
Ann went to a movie. The movie started at 11:55 A.M. and lasted 127 minutes.
What time did the movie end?
At 11:20 A.M. Alex started painting a fence.
By noon, he had painted this much of the fence:
If he continues at this rate, at what time should he finish painting this fence?
I paid a total of $121 for a toy train, including 10% tax.
How much does the toy train cost without the tax?
A farmer normally sells sheep for $200 each. This winter, the farmer is offering one free sheep for each purchase of three.
Three people want to buy 11 sheep each.
How many dollars will they save in total if they purchase the sheep together, rather than separately?
To complete one set of pipe installations, Bob the plumber needs the following components:
4 long pipes,
8 short pipes, and
12 fittings.
He has 66 long pipes, 46 short pipes, and 444 fittings in stock.
How many sets can Bob install?
If six people can stand on a square meter of carpet, how many of them can stand in an elevator cab that is 2 meters by 1 meters and 2.5 meters high?
The drama club is selling tickets to a play for $9 per ticket.
The cost to rent the theater and costumes is $500.
In addition, the printers are charging $1 per ticket to print the tickets.
How many tickets must the drama club sell to make a profit?
Apples are sold in bags of four that cost $5 per bag, or bags of six that cost $7 per bag.
What is the smallest cost at which you can buy 74 apples?
A class picnic is estimated to cost $232.
The boys agreed to contribute $1 more than the girls.
If there are 12 boys and 8 girls in the class, how much money should each boy contribute?
The distance between two buoys changes from 6 to 10 meters.
What is the distance between their anchors?
I have ten bills consisting of $5 and $10 bills.
The total amount of money is $70.
How many $5 bills do I have?
The boxing ring is 18 ft in length on each side between the ropes.
How much rope do we need for the ring?
A piece of soap is 50x40x100 mm.
A layer of 0.125 mm disappears every time I wash my hands.
How many times can I wash my hands with the piece of soap?
I place 14 chairs along the walls in an empty rectangular room.
The number of chairs along each wall is the same.
Find the number.
Which of these choices is the size of a picture with the same perimeter as a picture whose size is 9 x 16?
The button "8" on my calculator is broken.
I replace the button by multiplication operations.
What is the minimum possible number of multiplications to calculate
816 x 1886?
Metro Card prices: a single ride is $2.5 and a 7 day Metro Card costs $29.
How much will you save weekly by using the 7-day Metro Card if you use the Metro 4 times every day except Saturday and Sunday?
John is the proud owner of a race car.
In a month he uses 2 gallons, 3 gallons, 4 gallons, and 7 gallons of gasoline.
He drives 70 miles, 90 miles, 110 miles, and 130 miles.
What is the fuel economy of the car?
There are 14,600,000 tiles on the roofs of the old Swiss town of Murten.
How long would it take for a craftsman to tile the town roofs if he normally sets 200 tiles every day?
Assume that he works every weekend and during holidays.
An automobile salesperson earns a 5% commission on all sales.
How much will the salesperson have to sell in order to receive a monthly income of $20,000?
The thickness of a dollar bill is close to 0.0001 m and the height of a basketball player is 2 m.
How much money is needed to make a pile of dollar bills of the same height as the basketball player?
A couple has 81 coins to share between them.
How many coins will the man get if his wife always gets twice as many as he receives?
I require a passcode that uses 4 different numbers.
I chose the shortest possible path for my finger move.
Find the sum of the numbers.
I require a passcode that uses 4 different numbers.
I chose the largest possible path for my finger move.
Find the sum of the numbers.
If Jane walks to school in the morning and then rides the school bus back, it takes her an hour.
If she rides the bus both ways, it takes her 20 minutes.
How much time does it take for her to walk both ways?
Gerry bought ice cream cones for Jane, her friend Anna and for himself for $2.48 per cone.
If he gave the cashier a $10 bill, how much change will he get back?
After a 2-month tennis course, three friends recorded their weight loss.
Anna - 600 g
Bob - 1kg 300 g
Cindy - 0.8kg
Who lost more weight?
Anna's recipe needs 3/4 cup of sugar and 7/4 cup of wheat.
How many cups in all does Anna need for the recipe if she wants to make the cake twice as big as the recipe recommends?
Gerry and Jane were supposed to meet at 11:50.
If Gerry arrived 12 minutes before the time and waited only half an hour for Jane, when did she arrive?
There is an equal amount of money in pennies, nickels, dimes, and quarters.
What is the least amount of money in the cash register?
Penny = 1 cent.
Nickel = 5 cents.
Dime = 10 cents.
Quarter = 25 cents.
If today is a Sunday, then what day will it be one year later?
1 year = 365 days except a leap year, which includes 1 day more.
Gerry exchanged $82 for an equal number of pennies, nickels, dimes, and quarters.
How many dimes did Gerry receive?
Penny = 1 cent.
Nickel = 5 cents.
Dime = 10 cents.
Quarter = 25 cents.
Gerry bought Benny Bunny for $9, sold it for $8, bought it back for $7, then sold it for $6.
How much profit did he make?
A train departs from Lausanne to Zurich with 10 seconds delay and another one from Zurich to Lausanne with 20 seconds delay.
What train will be closer to Lausanne when they meet?
Passengers have a maximum allowable weight for their luggage.
They are then charged $4 for every kilogram overweight.
Gerry carrying 44 kg of luggage pays $80.
If Jane pays $100 how heavy is her luggage?
A piece of metal wire measures 2/3 m.
Without the use of any other measuring tools, fold the wire to get 0.5 m.
How many times do you fold the wire?
In order to test the Archimedes Principle, Sasha put a Lead weight inside a football and makes it air-tight with glue. The football now weighs 500g.
Sasha fills an outdoor water butt to the brim with water, but can't do the experiment that day because he has forgotten his gloves and the air temperature is 20°F.
After a few days the temperature has not risen, but he finds his gloves and does the experiment.
How much water is displaced by the football?
If you measure the temperature in Celsius, there is a formula:
The temperature T in degrees Celsius (°C) is equal to the temperature T in degrees Fahrenheit (°F) minus 32, times 5/9.
Author : Leslie Green
When it is 11am in Geneva (Switzerland) it is 5am in New York (USA). The flying time from Geneva to New York is 9 hours.
If the plane to New York takes off from Geneva at 9:35am, what time is it in New York when the plane lands?
(There are no stops or disruptions, just a normal flight.)
Author: Leslie Green
The boy dreams of being an astronaut.
How long does he need to study and work until his dream can become reality?
The photograph courtesy of Roland Sauter
6 boys and 12 girls attend prom at the Cool High School.
If each of the boys dances once with each of the girls and the boys were always occupied, how many extra dances does a boy get compared to a girl?
Time is money
If one minute is worth $24,000 for Bill Gates, how many dimes is one hour worth for him?
A dime is worth ten cents.
Forty cows drink forty-two hundred gallons of water each week.
How many gallons of water does each cow drink every day?
The photograph courtesy of Roland Sauter
You are making a bank deposit of $780.
You have an equal number of $50s, $10s and $5s to deposit.
How many of each bill do you have?
Benny Bunny has three carrots of lengths 6cm, 11cm and 15cm.
He uses these carrots to mark off different lengths.
What length cannot be marked if a carrot can only used once for each mark?
Mrs. Greedy refuses to use electricity and bought 28 candles for the next month.
She burns one candle every evening and always makes one new one from the remaining wax of seven burnt candles.
For how many days will she be able to use the candles?
When traveling with RiskyAir, passengers have a maximum allowable weight for their luggage.
They are then charged $5 for every kilogram overweight.
If Mary carrying 30 kg of luggage is charged $25, how much would her boy-friend John be charged for carrying twice the weight of luggage?
My bathroom scale is wrong.
The error is proportional to the measuring weight.
The heavier the person, the greater the error.
My real weight is 75 kg and the scale shows 82 kg.
What is my sister's weight if the scale shows 41?
A wall is being built with bricks of 10 cm height. The joints between the bricks are filled with a mortar (cement) layer that is 1 cm thick. Bricks are placed so that each joint is at the midpoint of a brick in the row below. In every other row 2 half bricks are placed at the ends. The two half bricks are made from a single brick. Imagine that the wall is 2 bricks wide.
How many bricks are needed to build such a wall that is 220 cm high?
Gerry has 30 meters of fence.
The length of the garden is three times its width.
How long is the garden?
The graph shows the total amount of money Anna has saved over five weeks.
If Anna continues to save the same amount of money each week, what will her total savings be in a year?
Four blocks make an up-and-down staircase with 2 steps up and 2 steps down.
How many blocks would be needed to build an up-and-down staircase with 12 steps up and 12 steps down?
A man and his equipment weigh 216 pounds on Earth.
If he takes the same set of scales to the moon and weighs himself there, the scales would read 36 pounds.
If his colleague weighs 210 pounds, what would be his weight on the moon?
Jane has to take a pill every 45 minutes.
She took the first pill at 11:30 am.
At what time does she take the fifth pill?
There are more than 20 students and less than 30 students in a class.
The ratio of boys to girls in the class is 6 : 7
If two boys join the class, what is the new ratio?
A thumb war tournament had eleven players. Each player played every other player only once, with no ties.
If five players won all their games and five players lost all their games, how many games did the eleventh player win?
A digital clock in a park of the Olympic capital Lausanne, Switzerland shows that there are 1203 days, 23 hours, 43 minutes, and 55 seconds left until the next Olympic Game in Tokyo.
Estimate how many years / months that is.
The picture is made in Basel, Switzerland, the city that is famous for numerous masterpieces of Modern Art.
Estimate the number of plates in the picture.
Mr. and Mrs. Smith borrow $54,000 to buy a new car for their son Gerry.
The loan is to be paid off in three years without interest.
How much is each monthly payment?
Nine ports are connected by maritime routes.
What is the least number of routes that can be closed to make it impossible to get from island A to island B?
The erosion rate of a famous English cliff is as high as 30cm a year.
If the rate does not accelerate and stays stable, how long does it take to lose the width of a house - 10 meters?
1 meter = 100cm
At a subway station, trains arrive from the city center every 11 minutes and at the same interval in the opposite direction.
Trains have just arrived on the platforms for both directions.
How many more trains are expected to arrive in the next hour from now?
A counting-out game
People are standing in a circle.
Counting begins at a person in the circle and proceeds around clockwise. The player who is selected at the conclusion of the rhyme is out.
The count starts with the next person.
Four children stand in a circle in the following order: Alex, Betty, Craig, and Diana.
If the count-out game starts from Alex, who will win the game?
They use the common American rhyme:
Rich Man, Poor Man,
Beggar Man, Thief,
Doctor, Lawyer,
Indian Chief.
Jane and Gerry start at the same point in a garden.
Jane walks due West and Gerry walks due East for 10 steps.
They turn left and walk 10 more steps.
Who is closer to the North Pole?
A bouquet of 9 garden roses costs $27.
How many roses can Gerry buy for Jane with the $1,000 bill in his pocket?
Roses can only be bought in sets of 9 at $27 per set.
Gerry made 6 snow balls of size 1.2m, 0.7m, 0.7m, 0.7m, 0.4m, and 0.3m and built two snowmen by stacking three balls.
How tall is the tallest snowman?
When a third of the students in Mrs. Rose Bush’s class joined the Green Garden Club, there were 16 students who did not join.
How many students are there in the class?
At the shop, the cash register (till) says that the total for the shopping comes to $9.20
The old man hands the assistant a $20 note and a 20 cent coin.
What is the correct response from the shop assistant?
The university's budget was cut from $2.2 million to $2,000 thousand. 
What time is 43210 seconds before midnight?
The picture shows the floor plan of a house. 
The number of hours left today is a third of the number of hours already passed. 
We want to buy 120 kilograms of potatoes. 
Find a set with the best value (weight) for money.
A dozen balloons cost 60 cents. 
Three boys put $7, $8, and $9 in a piggy bank. 
The cost of a party is $66 plus $6 per person, so what would be the cost of a party for 66?
A team played 80 games and won 40 percent of them. 
Four hundred dried cocoa beans weigh 1 pound. 
How many stars with a side length of 4 cm can I cut and bend from a wire that is 1,000 cm long?
In which team does a person get the greater amount of the healthy food if they share it evenly?
Estimate the cost of a carpet 15 yards long and 12 yards wide with the square-yard price of $0.25. 
Estimate the number of strawberries in the box if we see only a third of them.
How many kilometers are you traveling per half hour at this speed?
How many more cubes would be needed to make the pyramid 9 steps high?
Martin has $9,800 in $50 bills.