Find out the missing number in the picture attached:

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.

What does this rebus riddle means ?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

If six children and two dogs were under an umbrella, how come none of them got wet?

A man has a barrel filled with oil that weighs 100 pounds, and then he puts something into it. Now the barrel weighs less than 100 pounds. What did he put in the barrel?

What building has the most stories?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

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.

It belongs to you, but other people use it more than you do. What is it?