What will you call your mother's brother's brother-in-law?

A blonde put eyeliner on her head. Why?

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.

A train full of passengers goes through a tunnel. When the train comes out from the other end, there is no single person on the train.

How did it happen?

Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

Count the number of balls in picture below:

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

How many times can you subtract the number 5 from 25?

What do you think with the below Picture ?

You have two bottles of pills marked with labels A and B. The pills are identical. The doctor has asked you to take one A pill and one B pill daily. You cant take more or less than that.

While taking out the pills one day, you took out one pill from A and by mistake took out two from B. You have no idea which pill is which now.

You cant throw away the expensive pills. What will you do now?