I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?
What has many keys but can’t open a single lock?
There is a box in which distinct numbered balls have been kept. You have to pick two balls randomly from the lot.
If someone is offering you a 2 to 1 odds that the numbers will be relatively prime, for example
If the balls you picked had the numbers 6 and 13, you lose $1.
If the balls you picked had the numbers 5 and 25, you win $2.
Will you accept that bet?
Replace the letters of words with a number so that the below equation holds true
BASE +
BALL
---------
GAMES
----------
There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?
Three fair coins are tossed in the air and they land with heads up. Can you calculate the chances that when they are tossed again, two coins will again land with heads up?
My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?
A brand new Mobile Phone was on sale at 20% as a promotional offer. By what per cent must the Mobile price be increased to sell it at the original price again?
In the addition below, all digits have been replaced by letters. Equal letters represent equal digits and different letters represent different digits.
ABCABA
BBDCAA
ABEABB
ABDBAA
------- +
AAFGBDH
What does the complete addition look like in digits?
I am white when I am dirty, and black when I am clean. What am I?
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
