How can a man go eight days without sleep?

When can we add 2 to 11 and get 1 as the correct answer?

If 21x = 79x, what is the value of x?

Can you find out the number that should replace the question mark with a valid reason?

Which of the following words don't belong in the group and why?
CORSET, COSTER, SECTOR, ESCORT, COURTS

Can you count the number of matches in the picture below ?

A man desired to get into his work building, however he had forgotten his code.
However, he did recollect five pieces of information
* Fifth number + Third number = 14
* The fourth number is one more than the second number.
* The first number is one less than twice the second number.
* The second number and the third number equals 10.
* The sum of all five numbers is 30.

What is the code ?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?