See the given image carefully. What you have to do is move the blue checkers in the position of the black checkers and vice versa. You are only allowed to move the checker to an adjacent empty space. Do it in the least possible moves.

What is always in front of you but can’t be seen?

What's the only room from which no one can enter or leave

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

A sea diver is a real show-off. He showed everyone that he can hold his breath underwater for 15 minutes.

I went to the diver and told him that I can be underwater for double the time i.e 30 minutes.
He responded that he will give me 100$ if I would be able to do it. I won 100$.

What did I do?

What word is pronounced the same if you take away four of its five letters?

I know a 5-digit number having a property that With a 1 after it, it is three times as large as it would be with a one before it.

Guess the number?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

Where do fish keep their money?

An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?