There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

What's a single-digit number with no value?

You are in a land where thirty men and two women were dressed in classic black and white dresses.
They begin to fight as soon as any of them move.

Where are you?

I have Rs.50 and I spend it in the way as below.

What has many keys but can’t open a single lock?

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

Replace the question mark with the correct number.

I have eight fingers and two thumbs but I do not live. What Am I?

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.

What runs around the whole yard without moving?