Who is that with a neck and no head, two arms and no hands? What is it?

Replace the question mark with the number below given a simple math problem.

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

In a football game, Christina defeated Teresa by 2 - 0 but no man from either side scored. How can this be possible?

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?

An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

What does an Island and the letter T have in common?

How many sides does a circle have?

Why is it very easy to weigh a fish?