When my father was 31 I was 8. Now he is twice as old as me. How old am I?

How far can you walk into the woods?

When it is alive we sing, when it is dead we clap our hands. What is it?

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

In four steps you need to move the word 'cold' From 'warm' by replacing one alphabet at a time such that every word formed at each step is acceptable in English Dictionary.

How many times can you subtract the number two from the number fifty?

I was speeding and ran through a stop sign, yet two traffic officers who were there do nothing about it.

why?

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?