There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

People make me, save me, change me, raise me. What am I?

When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?

It is a nine-letter word.
The exact opposite of the phrase "friendly and outgoing"
It contains the word "over".
It starts will a vowel.

What is it?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

I have branches, but no fruit, trunk or leaves. What am I?

How many times do a clock's hands overlap in a day ?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

What work can one never finish?

You order chicken wings at KFC in the boxes of 6, 9 and 20. What is the largest number of wings that you cannot obtain by buying in any combination of the boxes?