There is a box in which distinct numbered balls have been kept. You have to pick two balls randomly from the lot.

If someone is offering you a 2 to 1 odds that the numbers will be relatively prime, for example
If the balls you picked had the numbers 6 and 13, you lose $1.
If the balls you picked had the numbers 5 and 25, you win $2.

Will you accept that bet?

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?

You need to remove two matchsticks to make the below equation true. Can you do it ?

How far can you walk into the woods?

Before reading ahead, you must know the fact that only one of the people here is telling the truth.

A says that B is lying.
B says that C is lying.
C says both A and B are lying.

Can you find out who is speaking the truth?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

Count the number of triangles in the picture below:

You board a train. The train will have to enter a tunnel soon. You are claustrophobic. Which place is the best for you to sit?

Prove that twice of ten is the same as twice of eleven.

Where do fish keep their money?