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.

A man has eighty-one cows ( numbered 1,2,3...81 as such). The beauty is that cow no. 1 gives 1ltr of milk, cow no. 2 gives 2ltrs of milk and so on. The man wants to equally distribute the cows among his nine sons so that each one of them gets the same quantity of milk.

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

How is a fly different from a mosquito?

Which digit occurred maximum times between the number 1 and 1000?

Prove that twice of ten is the same as twice of eleven.

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

What does this mathematical rebus means ?

Can you count the number of squares in the given picture?

A little girl goes to the store and buys one dozen eggs. As she is going home, all but three break. How many eggs are left unbroken?