Why is it very easy to weigh a fish?

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?

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?

What can you serve, but never eat?

Prove that the below maths equation is true.

8 + 8 = 91

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

What begins with T, ends with T, and has T in it?

As shown in the picture below, we can see a boy hanging on the tree branch to save his life. There are various ways in which he can die like1. A snake hanging toward the right waiting to bite the boy.2. A roaring Lion near the tree.3. Two crocodiles are ready to attack if the boy reaches near water. The tree is chopped to some extent, so can fall as if he moves a lot. Can you give this boy an escape plan?

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

What seven-letter word has hundreds of letters in it?