A Man gave one of his sons 10 cents and another son was given 15 cents. What time is it?
Hint: Figure out the relation between time and number, is not so easy..:)

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

In a rainy season, one day 3 huge ladies walked under a normal-sized umbrella.
The umbrella is not huge enough to accommodate all 3 ladies yet not a single lady got wet. Why?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

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

How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

What animal walks on four legs in the morning, two legs during the day, and three legs in the evening?

Oedipus, the king of Thebes, figured out the answer to the riddle:

Find three whole, positive numbers that have the same answer when multiplied together as when added together.