A woman lives in a Tall building thirty-six floors high and served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?

In Greek mythology, the Sphinx sat outside of Thebes and asked this riddle of all travellers who passed by. If the traveller failed to solve the riddle, then the Sphinx killed him/her. And if the traveller answered the riddle correctly, then the Sphinx would destroy herself. The riddle:

What goes on four legs in the morning, on two legs at noon, and on three legs in the evening?

Oedipus solved the riddle, and the Sphinx destroyed herself.

You measure my life in hours
I serve you by expiring
I vanish faster when I am thin
and slower when I am thick
The wind is my energy
What am I?

You need to arrange three 7 and mathematical symbols to form number 1?

He runs but never walks. Murmurs, but never talks. Has a bed, but never sleeps. And has a mouth, but never eats?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

Can you count the number of squares in the figure below?

How many times in a given day, minutes and hour clock comes in a straight line ?