When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

There was a greenhouse.
Inside the greenhouse, there is a white house.
Inside the white house, there is a red house.
Inside the red house, there are lots of babies.

What is It?

What do you think with the below Picture ?

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

What is wrong in the below Picture?

A mother is 21 years older than her child. In exactly 6 years from now, the mother will be exactly 5 times as old as the child.
Where's the father?

Name a key which is hardest to turn.

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?