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.

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

Remove two matchsticks to make the below equation correct.

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

I can be made.
I can be cracked.
I can be told.
I can be played.

Who am I?

A bomb goes off.
Carnage.
One person, only a few feet away, survives! How can this be?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?