Math Riddles &amp; Number Puzzles

Dean Sam and Castiel are three brothers. Interestingly their current age is prime. What's more interesting that difference between their ages is also prime. H...

If 3 cats can kill 3 rats in 3 minutes, how long will it take 100 cats to kill 100 rats?

One brick is one kilogram and half a brick heavy. What is the weight of one brick?

An interesting formula for generating a good many (but not all) primes is n2 + n + 41. If we plug in consecutive integers 1, 2, 3, etc., at least up to a certai...

A man forgot the secret code to open his locker. But he remembers the following clues: Fifth number plus the third number equals fourteen. First number is one...

Cathy has six pairs of black gloves and six pairs of brown gloves in her drawer. In complete darkness, how many gloves must she take from the drawer in order t...

There is a party of 100 high-powered politicians. All of them are either honest or liars. You walk in knowing two things: - At least one of them is honest. - I...

What is the largest possible number you can write using only 2 numbers - just 2 numbers, no other mathematical symbols?

There are two planes. One is going from New York to London at a speed of 600 MPH. The other is travelling from London to New York at a speed of 500 MPH. When t...

There is a clothing store in Bartlesville. The owner has devised his own method of pricing items. A vest costs $20, socks cost $25, a tie costs $15 and a blouse...

When is 1500 plus 20 and 1600 minus 40 the same thing?

How can you add eight 8's to get the number 1,000?

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

Mr. Smith has 4 daughters. Each of his daughters has a brother. How many children does Mr. Smith have?

If 1+9+8=1, what is 2+8+9?

A child playing on the beach had 6-1/6 sand piles in one place and 3-1/3 in another. If he put them together, how many sand piles would he have?

Use the numbers 2, 3, 4 and 5 and the symbols + and = to make a true equation.

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? (3 possible solutions).

I am four times as old as my daughter. In 20 years time I shall be twice as old as her. How old are we now?

What has 3 feet but no toes?

Take 9 from 6, 10 from 9, 50 from 40 and leave 6.

If Mr. Flynn is 90 centimeters plus half his height, how tall is he?

In a pond there are some flowers with some bees hovering over the flowers. How many flowers and bees are there if both the following statements are true: 1. If...