What has to be broken before you can use it?

You are given four tennis balls and asked to arrange those balls in a manner that the distance between each one of them is exactly equal. How will you do it?

I am an odd number. Take away a letter and I become even. What number am I?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

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

Today is John's birthday.
A year ago, John had five candles and he lit all the candles except the one at the last.
Now he is going to light all the candles.

How old is John Today?

(He is not five today.....)

A man is walking down a road with a basket of eggs. As he
is walking he meets someone who buys one-half of his eggs
plus one-half of an egg.
He walks a little further and meets another person who buys
one-half of his eggs plus one-half of an egg.
After proceeding further he meets another person who buys
one-half of his eggs plus one half an egg. At this point, he
has sold all of his eggs, and he never broke an egg.
How many eggs did the man have to start with?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

What has 88 keys?

I have eight fingers and two thumbs but I do not live. What Am I?