What number should come in place of the question mark below?

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?

Which English verb becomes past tense just by rearranging the letters?

What has many keys but can’t open a single lock?

A father is locked up in jail. His wife has gone bankrupt. Their male child has to sell his hotel in order to gain some money. Yet their girl child does not care and is quite happy.

How can someone be so rude?

It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?

What part of the chicken has the most feathers?

Using eight eights and addition only, can you make 1000?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

A plane crashed between the border of Mexico and America. Where do you bury the survivors?