If eleven plus two equals one, what does nine plus five equal?

You are trapped in a room with two doors. One leads to certain death and the other leads to freedom. You don't know which is which.
There are two robots guarding the doors. They will let you choose one door but upon doing so you must go through it.
You can, however, ask one robot one question. The problem is one robot always tells the truth, the other always lies and you don't know which is which.
What is the question you ask?

I am 5 letters long.
My first two tell you who I am
My first 3 could be a medicine
My last three reversed could be a young boy.
My 4th, 3rd and 2nd in that order could be a fruit drink.
If you have me you may hang me round your neck
WHAT AM I ?

Can you spot the hidden girl in the picture below?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

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

what does the below rebus means?

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?

What country can make you shiver?