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John was six years old -Math riddle

64.Math Riddles
When John was six years old he hammered a nail into his favorite tree to mark his height. Ten years later at age sixteen, John returned to see how much higher the nail was. If the tree grew by five centimeters each year, how much higher would the nail be?
      Explanation :  
      The nail would be at the same height since trees grow at their tops.