Jack and Tree Height

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?

Similar Riddles

I ask Joseph to pick any 5 cards out of a deck with no Jokers.

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Jack looks at the 4 cards i gave him, and says out loud which card Joseph is holding (suit and number). How?

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We have arranged four hats in the below picture to assist you.

Arrange Hats in Squares

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No Solution

In 2007, a puzzle was released and $2 million prizes were offered for the first complete solution. The competition ended at noon on 31 December 2010, with no solution being found. Wiki