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.

If it took eight men ten hours to build a wall, how long would it take four men to build it?

What goes up but never comes down?

Which is the correct shadow of the bird?

I can write cow in 13 letters.

Can You?

how come the second man dies?

If an electric train is travelling south, then which way is the smoke going?

Next Number in the Series,

5, 16, 49, 104, ?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

During an interview, the interviewer ordered hot coffee for the candidate to relieve the stress. The coffee was kept before him. After a minute, the interviewer asked him, 'What is before you?' He replied 'Tea'.

The candidate was selected immediately. Why?