How many sides does a circle have?

If eleven plus two equals one, what does nine plus five equal?

I am dry when I go inside, but wet when I am pulled outside.
The longer I am inside, the stronger I get
When I am completely out, I am wet and I literally sag
Who am I?

What have one eye but still cannot see?

You Throw The Outside, Cook The Inside
Eat The Outside, Throw The Inside.

What Is It?

How many times can you subtract the number two from the number fifty?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

Three ants are going up a hill, one behind the other. The last ant then says to the other ants, 'There is an ant behind me!'' How come?

A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?