I am a prime number.
The double of myself is equal to the square of me.

which number am I?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

A Monkey, a squirrel, and an Eagle are racing to the top of the mango tree. Assuming all these animals are in perfect shape, Which animal will reach to Banana first?

It is always ahead of me yet I can never see it. What is it?

What is so fragile that saying its name breaks it?

There is a wide field of corn. A goose finds its way into the field and starts running. Can you find out till which point the goose can run into the field?

He digs out tiny caves and stores gold and silver in them. He also built bridges of silver and made crowns of gold. They are the smallest you could imagine. Sooner or later everybody needs his help, yet many people are afraid to let him help them. Who is he?

What always comes into a house through the keyhole?

If "P" means "-", "Q" means "/", "R" means "+", and "S" means "*" then find the value of the following:

21 Q 7 R 9 S 10 P 13