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 below Rebus indicate?

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

I look at you, you look at me, I raise my right, you raise your left. What am I?

What does this say?

XLR8

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

It is always ahead of me yet I can never see it. What is it?

You have a roll of cloth 1km long. You have a machine which cuts this roll into pieces of 10-meter-long cloth.

How long would it take for the machine to cut the roll if each cut took 4 secs?

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.

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?