If 1+9+8=1, what is 2+8+9?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

What is the riddle which can be asked all day with a different correct answer each time.

Only one colour, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

What number divided by 4 is the same as that number minus 4?

Can you identify the famous TV character from the rebus below?

John has eleven friends. He has a bowl containing eleven apples. Now He wants to divide the eleven apples among his friends, in such a way that an apple should remain in his bowl.
How can He do it?

What does it mean?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

You are in a room with no metal objects except for two iron rods. Only one of them is a magnet.
How can you identify which one is a magnet?