Which number should replace the question mark?

What does does this rebus picture means ?

The answer I give is yes, but what I mean is no. What was the question?

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

There are three boxes. One is labeled "APPLES" another is labeled "ORANGES". The last one is labeled "APPLES AND ORANGES". You know that each is labeled incorrectly. You may ask me to pick one fruit from one box which you choose.

How can you label the boxes correctly?

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

You want to boil a two-minute egg. If you only have a three-minute timer (hourglass), a four-minute timer and a five-minute timer, how can you boil the egg for only two minutes?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

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