Can you convert the number zero(0) into a positive number using just one mathematical operator ?

I am working in a bus company. The company recently went under expansion and therefore there was not enough room for all the buses. As a result, twelve buses had to be stored outside.

If the company decides to expand the garage space by forty percent, enough space to accommodate the current buses will be created leaving enough space for twelve more buses if the need arises in future.

Can you calculate the number of buses that the company owns at present?

What is red and smells like blue paint?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

Solve the mathematical equation in the picture below.

The captain of a ship is telling you an interesting story and then poses a question. He says, “I have travelled the oceans far and wide. One time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly. Can you tell me how that was possible?”

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.

I always drive my customer away.

Who am I?

Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?

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