I have an eye but still cannot see.

Who am I?

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

What do you see in the given picture?

Which five letter word can be added at the end of below word to form a
valid word?

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

A worker is to perform work for you for seven straight days. In return for his work, you will pay him 1/7th of a bar of gold per day. The worker requires a daily payment of 1/7th of the bar of gold. What and where are the fewest number of cuts to the bar of gold that will allow you to pay him 1/7th each day?

A Man gave one of his sons 10 cents and another son was given 15 cents. What time is it?
Hint: Figure out the relation between time and number, is not so easy..:)

You throw me out when you want to use me and you take me in when you don't want to use me.

Who Am I?

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?

Can you calculate the probability of getting a sum of six when a dice is thrown twice?