Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?
When 99 is considered higher than 100?
Can you move 2 matchsticks to form four equal sized squares.
Can you Find and name the hidden bird in the picture below ?
I have thought of a number that is made up by using all the ten digits just once. Here are a few clues for you to guess my number:
First digits is divisible by 1.
First two digits are divisible by 2.
First three digits are divisible by 3.
First four digits are divisible by 4.
First five digits are divisible by 5.
First six digits are divisible by 6.
First seven digits are divisible by 7.
First eight digits are divisible by 8.
First nine digits are divisible by 9.
The number is divisible by 10.
Can you find out the number ?
How many times can you subtract the number two from the number fifty?
What is both possible and impossible at the same time?
Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()
It's a test that will check your IQ.
Suppose you have one 11 minute hourglass and one 13 minute hourglass.
Can you measure exactly fifteen minutes using them ?
You are a cab driver who pools passengers. You pick 3 people from a destination and drop 1 after an hour. 2 people climb aboard at the same time and you drop 3 at the next destination. After some time, you pick 2 passengers only to drop 1 after a short distance where 3 more passengers climb up the cab. You leave the rest of the passengers one by one to their destination and then come back home.
Can you tell the eye color of the cab driver?
Remove two matchsticks to make the below equation correct.
In 2007, a puzzle was released and $2 million prizes were offered for the first complete solution. The competition ended at noon on 31 December 2010, with no solution being found. Wiki