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?




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In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
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Game of Chess

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Crossword puzzles

In the 1920s, people feared that crossword puzzles would contribute to illiteracy.