Do You See It?

When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

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?

There are 3 apples in the basket and you take away 2. How many apples do you have now?

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

Can you find out the total number of triangles in the given figure?

What is so fragile that saying its name breaks it?

What brings you down but never up?