A man was just doing his job when his suit was torn. Why did he die three minutes later?

Get total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator.
Do you ?

What four weights can be used to balance from 1 to 30 pounds?

Can you quickly find which two matchstick figures are identical?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

If,

20 % 5 = 24

21 % 7 = 33

42 % 6 = 67

Then;

66 % 6 = ?

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.

The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member. Find how much younger is the new member ?

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

When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?