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

Can you count the number of triangles in the given picture?

Why do people go to bed?

Manish has to secure 40% marks to pass his B.tech final exams.
He got just 40 marks and failed by 40-marks.

What is the maximum marks?

What two things can you never eat for breakfast?

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?

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?

The centre of the third figure is empty. What digit should fit inside?

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?