2, 3, 5, 9, 17, _ What is the next number in the sequence?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

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 are the next two letters in the following series and why?
W A T N T L I T F S _ _

*Hint: Check Puzzle Title

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

how come the second man dies?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

There are forty elephants and they have forty-fore heads. How can this be possible?

Solve the mathematical equation in the picture below.

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?