In a competitive exam, each correct answer could win you 10 points and each wrong answer could lose you 5 points. You sat in the exam and answered all the 20 questions, which were given in the exam.
When you checked the result, you scored 125 marks on the test.

Can you calculate how many answers given by you were wrong?

Out of three Friends John, Jacob and Jonny one of them is a king, one is a bureaucrat, and one is a Spy.

The king always tells the truth, the bureaucrat always lies, and the Spy can either lie or tell the truth.

John says: Jonny is a bureaucrat
Jacob says: John is a king
Jonny says: I am a Spy

Tell me, Who is the king, who is the bureaucrat, and who is the Spy?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

You can hear me, but you can't touch or see me.

What am I?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

If you paint a brown house white it will become a white house. If the stoplight changes from red to green, then the light is green. So, if you throw a white shirt into the Red Sea, what will it become?

A father's child, a mother's child, yet no one's son.

Who am I?

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?