If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

What is always in front of you but can’t be seen?

There is a square piece of paper with a hole that is denoted by the circle on the top right side in the given picture. You have to cut the paper in a manner that it forms two and only two separate pieces of paper and then rearrange the pieces in a manner that the holes come in the centre of the paper.

A boy and his father are caught in a traffic accident, and the father dies. Immediately the boy is rushed to a hospital, suffering from injuries. But the attending surgeon at the hospital, upon seeing the boy, says 'I cannot operate. This boy is my son.' How is this situation explained?

My first is in chocolate but not in ham. My second is in cake and also in jam. My third at tea time is easily found. Altogether, this is a friend who is often around. What is it?

What came first, the chicken or the egg?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

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

Find the value of "?" in the ball picture Riddle below:

John drives to his office at 20km/hr. After reaching the office, he realizes that today is a holiday. He went back at an average speed of 30km/hr. Discounting the time spent in the stoppage what was the average speed of his journey?