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Tricky Nine Maths Riddle |

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A new medical building containing 100 offices had just been completed. Mark was hired to paint the numbers 1 to 100 on the doors. How many times will Mark have to paint the number nine?

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The correct answer is twenty (9,19,29,39,49,59,69,79,89,90,91,92,93,94,95,96,97,98,99(2) and so on).

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