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.

The more you take me, the more you leave me behind.
Who Am I?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

What runs around the whole yard without moving?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

A B C D E F G H

These are the letters given to you. Now you have to find out the letter that comes two to the right of the letter which is immediately to the left of the letter that comes three to the right of the letter that comes midway between the letter two to the left of the letter C and the letter immediately to the right of the letter F.

A woman is sitting in her hotel room and hears a knock at the door. She opens the door to see a man whom she’s never met before. He says, “I’m sorry, I have made a mistake, I thought this was my room.” He then goes down the corridor and into the elevator. The woman goes back into her room and calls security. What made the woman so suspicious of the man?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?