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?

Can you move 2 matchsticks to form four equal sized squares.

On a special event at the prison, 5 prisoners John, Jacob, Krist, Tang, and Dang given a chance to go to a sauna and can bring one thing with them.

Following are the things that the prisoners bring with them.
John: A soda
Jacob: Thermos
Krist: Book named "How to kill"
Tang: A Walkman
Dang: Harmonica

Since it is a Sauna, no one can see each other. After a while When the steam is switched, Tang was found dead and there was blood all around.
J Bond was called and he instantly come to know who can be the murderer. How?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

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

If a wheel has 54 spokes, how many spaces are there between the spokes?

What occurs twice in a week, once in a year but never in a day?