There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

Can you count the number of children in the picture below

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

Can you find out the next digit in the following series ?

0, 0, 1, 3, 2, 6, 3, 9, 4, 12, 5, ?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

Two men are in a desert. They both have packs on. One of the guys is dead. The guy alive has his pack open, and the guy who is dead has his pack closed. What is in the pack?

Find the next number in the sequence

5 12 24 36 ?

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

Solve the counting riddle by identifying the number of triangles in the given picture.

During which month do people sleep the least?