Good Riddles

Question: What flag has five circles in it?

Question: There are 20 birds in a tree. A man comes and shoots one of the birds. How many birds are left?

Question: While you were folding a letter I got you.
Usually you will do whatever it takes to avoid me,
but now you can't help but find me.

What am I?

Question: You put me in dry but then I get wet.
The longer I stay in, the stronger it will get.

What am I?

Question: You have a cup of tea (A) and a cup of coffee (B) (equal amounts), and you take a spoonful of the coffee (B) and mix it thoroughly into the tea (A). Then you take a spoonful of tea (A) and mix it with the coffee (B). Does the cup that originally had tea in it (A) have more coffee or does the cup that originally had coffee in it (B) have more tea?