There was a strange boy who was born before his father. How can this be possible?

Find the next number in the series below

21 32 54 87 131 ?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

Find the next number in the series.
1 10 24 43 67 ?

You board a train. The train will have to enter a tunnel soon. You are claustrophobic. Which place is the best for you to sit?

As we know that white starts the game of chess. Can you find the scenario shown in the picture below is possible when all the white pieces are at the original place while the black pawn is not as in the below picture?

A woman lives in a skyscraper thirty-six floors high and is served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?