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.

Two guards were guarding the camp.Guard-1 was looking towards the south to make sure no threat is coming from the road.Guard-2 was looking at the north to make sure no threat is coming from the top. Suddenly Guard-1 ask the Guard-2 why he is smiling?How Guard-1 knows that Guard-2 is smiling?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

What is the largest number you can write with just 3 digits?

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?

Why is Saturday stronger than Monday?

John buys rice at Rs.60/kg from Britain and then sells them at Rs.5/kg in India. As a result of this, he becomes a millionaire. How come?

I know a 5-digit number having a property that With a 1 after it, it is three times as large as it would be with a one before it.

Guess the number?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?