Anna has been hired to paint the numbers 1 through 100 on 100 apartments.
How many times would he have to paint the number 7?

20 times.
(7, 17, 27, 37, 47, 57, 67, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 87, 97)

Anna has been hired to paint the numbers 1 through 100 on 100 apartments. 
How many times would he have to paint the number 7?

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