9 in 1 to 100

A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?




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0 0 0 = 6
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2 2 2 = 6
3 3 3 = 6
4 4 4 = 6
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