What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

Who always enjoys poor health?

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?

You walk into an old horror house. It has no power or plumbing. Once inside, you see three doors. Each door has a number on it. Behind each door is a way for you to die. Behind door number one, you die by getting eaten by a lion. Behind door number two, you die by getting murdered. Behind door number three, you die by an electric chair. You can’t turn back, so you have to go through a door. Which door do you go through?

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.

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

If it took eight men ten hours to build a wall, how long would it take four men to build it?

What is the below Rebus indicate?

I can write cow in 13 letters.

Can You?

There was a strange boy who was born before his father. How can this be possible?