Your last good ping-pong ball fell into a narrow metal pipe embedded one foot deep in concrete.
How can you get it out undamaged, if all the tools you have are your tennis paddle, shoe laces, and plastic water bottle, which does not fit into the pipe?

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

10+10 and 11+11 can give you the same answer.

Explain how?

The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

What number when divided in half becomes zero?

I am a type of room you cannot enter or leave. Raised from the ground below, I could be poisonous or a delicious treat. What am I?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?

What came first, the chicken or the egg?