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 kind heart person buy packed food at 3$/packet from United states and sells them at 1$/packet at Africa. After some time he becomes a millionaire.

How come the guy become millionaire ?

What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

What kind of band never plays music?

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?

Can you find out the number that should replace the question mark with a valid reason?

Take one out and scratch my head, I am now black but once was red. What am I?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

John was piloting a plane behind a car but was never able to overtake it. Why?