what does the below math rebus puzzle mean?

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

If eleven plus two equals one, what does nine plus five equal?

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

Jack have ten pairs of black socks, eight pairs of white socks and seven pairs of green socks. Everything is mixed in a draw. As there is no light he were not able to identify the colour of the socks. How many of the socks did he want to take to match one pair

What can you see in the middle of March and April that you can never see in any other month?

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

Can you write down eight eights so that they add up to one thousand?

A spy was in Canada trying to steal insider information on how to set up new Maple Syrup factories in their country. He was introduced to the operations manager of the biggest factory in Canada. However, the manager was suspicious and decided to test him with a question before he trusted him. So he asked, “What would you be sure to find in the middle of Toronto?” The spy thought fast and came up with an answer for the manager. What was his answer?

You are driving down the road in your car on a wild, stormy night, when you pass by a bus stop and you see three people waiting for the bus

An old lady looks as if she is about to die.
An old friend who once saved your life.
The perfect partner you have been dreaming about.
Knowing that there can only be one passenger in your car, whom would you choose?