The 15 Minutes Recipe

A recipe requires 15 minutes to cook. You have a 7 minutes hourglass and an 11 minutes hourglass with you. How will you measure 15 minutes using them?

Giving Away Vegetable Oil

You are distributing vegetable oil. There are 21 bottles in total out of which 7 are full, 7 half empty and 7 empty. The oils has to be distributed among three people.
How will you distribute so that each person gets equal number of bottles and the same quantity of oil?

The Bracelet and the Sales Tax

Casey buys a bracelet. She pays for the bracelet and pays $0.72 in sales tax. The sales tax rate is 6%.
What is the original price of the bracelet, before tax?

The Hourglasses

If you have an 11 minute and 13 minute hourglass, how can you accurately time 15 minutes?

The Book Shelf

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

An Ant On a Rope

An ant gets onto one end of a tight rope that is 1 meter long. The ant is traveling at 1 centimeter per second, but the entire rope is being stretched an extra 1 meter (1,000 centimeters) a second (it can be stretched forever).
Will the ant ever reach the other end of the rope?

Crossing the Bridge

Four people need to cross a bridge in 17 minutes in the middle of the night. The bridge can only hold two or less people at any time and they only have one flashlight so they must travel together (or alone). The flashlight can only travel with a person so every time it crosses the bridge it must be carried back. Tom can cross in 1 minute, John can cross in 2 minutes, Sally can cross in 5 minutes, and Connor can cross in 10 minutes. If two people cross together they go as fast as the slower person.How can they cross the bridge in 17 minutes or less?

From Apple-York to Strawberry-Ville

You have been given the task of transporting 3,000 apples 1,000 miles from Apple-York to Strawberry-Ville. Your truck can carry 1,000 apples at a time. Every time you travel a mile towards Strawberry-Ville you must pay a tax of 1 apple but you pay nothing when going in the other direction (towards Apple-York).
What is highest number of apples you can get to Strawberry-Ville?

The Phone Pad

What number do you get when you multiply all of the numbers on a telephone's number pad?

Plus vs. Times

Given two 2s, "plus" can be changed to "times" without changing the results: 2 + 2= 2 x 2.
The solution with three numbers is easy too: 1 + 2 + 3= 1 x 2 x 3.
Now find the answer for 4 numbers and for 5 numbers.

How Many Pluses

How many pluses should we put between the digits of 987,654,321 to get a total of 99, and where?

The Short Cut and the Train

Walking home one day, you take a short cut along the train tracks. The tracks cross a narrow bridge over a deep gorge. At the point you are 3/8 of the way across the bridge, you hear the train whistle somewhere behind you. You charge across the bridge, and jump off the track as the train is about to run you down. As it happens, if you had gone the other way, you would have reached safety just before being run over as well. If you can run ten miles per hour, how fast is the train moving?

From 98 to 720

What's the Next Number?

Nonstop Trains

A nonstop train leaves Moscow for Leningrad at 60 mph. Another nonstop train leaves Leningrad for Moscow at 40 mph. How far apart are the trains 1 hour before they pass each other?

Product Equals Sum

Adding Eights

Subtracting from 25

365 Apples

The Business of Horses

A businessman buys a horse for $10 and sells it for $20. He then buys the same horse for $30 and sells it for $40.
How much has the businessman earned in these 2 deals?

A Bunch of Babies

If you have two twins, three triplets and four quadruplets, how many people do you have?

The Pawn Shop

Jack had only $2, but he needed $3 for his cab fare home. He went to a pawn shop and pawned his $2 for $1.50. Jack then bumped into Don and told him that he would sell him his $2 pawn ticket for $1.50. Dan agreed. Since Jack started out with $2, and he ended up with $3, who is out the extra dollar and why?

The Handshakers

If seven people meet each other and each shakes hands only once with each of the others, how many handshakes will there have been?

The One-Sided Toaster

Susan uses a toaster that has 2 slots. The toaster toasts one side of each piece of bread at a time, and it takes exactly 1 minute to do so.
If Susan wants to make three pieces of toast, what is the LEAST amount of time she needs to toast them on both sides?

The Two Kids

Mr. Thompson has 2 children. One of them is a boy. What are the odds the second kid is also a boy?

Reversed Age

The ages of a father and son add up to 66. The father's age is the son's age reversed. How old could they be?
* There are THREE possible solutions

The Angle of the Clock

What's the angle between minute hand and hour hand at a quarter past three?

A Tale of Two Coins

If you have two coins which total 35 cents and one of the coins is not a dime, what are the two coins?

Four Daughters

Mary has four daughters, and each of her daughters has a brother. How many children does Mary have?

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