Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

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

A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

Can you find the largest Three-digit number whose sum is 14 and whose square is less than 5,00,000?

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.

There was a blind beggar living on the footpath of a street. Suddenly one day, the beggar's brother died. What was the relation of the blind beggar with the person who died?

PS: Brother is not the answer.