Solve the mathematical equation in the picture below.

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?

A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?

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?

Name a key which is hardest to turn.

Can you complete the sequence?

192, 021, 222, 324, 252, 627, 2__, 9__?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

On a bright sunny day, two fathers took their son fishing in the lake. Each man and son were able to catch one fish. When they returned to their camp, there were only three fishes in the basket. What happened?

PS: None of the fish were eaten, lost, or thrown back.

How could a baby fall out of a twenty-story building onto the ground and live?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?