If a wheel has 54 spokes, how many spaces are there between the spokes?

In the Thar desert, 3 men found a big 24L Jar is full of water. Since there is a shortage of water so they decided to distribute the water among themselves such that they all have equal amounts of it. But they only have a 13L, a 5L and an 11-litre Jar.

How do they do it?

A man dies of old age on his 25 birthday. How is this possible?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

How many triangles are there on the puzzle below?

You are in a room with no metal objects except for two iron rods. Only one of them is a magnet.
How can you identify which one is a magnet?

John is looking at Jenifer, but Jenifer is looking at Jacob. John is married, but Jacob is not.

Is a married person looking at an unmarried person ?

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 has a ring but no finger?

A word I know has six letters it contains, remove one letter and 12 remain. What is it?