John was visiting his friend Jacob. He found out that his friend's wife had just killed a burglar in self-defense.
John asks Jacob about what happened and he told that "His wife was watching television when suddenly the bell rang. She thought that it is her husband Jacob but she found the burglar who attacked her instantly and she got so frightened that she killed the burglar immediately with the knife.
John asked the police to arrest his friend's wife. Why?

What is greater than gold but cannot be bought. it can never be sold and can earn if its sought. though it can be broken, it can still be fixed. for by birth it can't start nor by death it is ended.what am i?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

Considering the below equation:

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

Then, I + II + III = ?

A man is found unconscious in front of a store at two in the morning. His head is bleeding and there’s a brick laying next to him. When the police arrive, they carry the man to jail. Why did they arrest him?

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?

I have an eye but still cannot see.

Who am I?

Replace the question mark with the number below given a simple math problem.

Why do people go to bed?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?