SOLUTION: Gym lockers are to be numbered from 1 to 99 using metal numbers to be placed on each locker. How many 7's are needed?

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Question 279786: Gym lockers are to be numbered from 1 to 99 using metal numbers to be placed on each locker. How many 7's are needed?

Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
07
17
27
37
47
57
67
70,71,72,73,74,75,76,77,78,79
87
97
.
.
.
Add them up.
20 in all.