Kids Riddles

Question: When is 1500 plus 20 and 1600 minus 40 the same thing?

Question: I'm number three.
But I'm not a number.
I'm hot and cold at the same moment but not at the same time.
I'm number three.
But I'm not a number.

Who or what am I?

Question: Why can't Kevin, who is now living in Canada, not be buried in the USA?

Question: 2 men catch 2 fish in 2 minutes. At this rate, how many men could catch 500 fish in 500 minutes?

Question: A thousand wheels, but move I do not.
Call me what I am, call me a lot.

What am I?