What has to be broken before you can use it?

A boy purchased a book from a bookkeeper and gave him $100.
The cost of the book is $50 but the bookkeeper has no change, so he gets the change from the next shop and returns the boy his $50.

After some time the next shopkeeper came with the $100 note and told the bookkeeper that the note was a fraud, so he took the money back.

How much loss did the bookkeeper face?

Can you count the number of triangles in the picture below?

If 21x = 79x, what is the value of x?

Six glasses are in a row. The first three are filled with milk and the last three are empty. By moving only one glass, can you arrange them so that the full and the empty glasses alternate?

I look at you, you look at me, I raise my right, you raise your left. What am I?

You are on a Boat in the mid of a river. You have two cigarettes with you. One of these two you have to light, how will you light the cigarette?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

What is the below Rebus indicate?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?