what does the below rebus means?

You have a basket containing ten apples. You have ten friends, who each desire an apple. You give each of your friends one apple.
Now all your friends have one apple each, yet there is an apple remaining in the basket.
How?

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

Why Aeroplane windows are round?

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H

Buy me, smell me or deliver me, I do not change.

Who am I?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

How could a baby fall out of a twenty-story building onto the ground and live?

Once upon a time, there was a castle on a square island. The entire island was surrounded by a 14m wide trench. The Romans had wanted to invade the castle and had brought a few wooden planks along with them to facilitate themselves in crossing the moat. The planks were however found to be only 13m long.

The Romans still managed to cross the trench. How did they do it?

John has played 50 ODI's and his average is 50. How many runs should he score in his 51st ODI, so that his average score jumps to 51?