SOLUTION: Perform the indicated operations and word problems: 3. Gym Lockers are to be numbered from 1 to 99 using metal numbers to be placed on each locker. How many 7s are needed?

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Question 763661: Perform the indicated operations and word problems:
3. Gym Lockers are to be numbered from 1 to 99 using metal numbers to be placed on each locker. How many 7s are needed?

Answer by solver91311(24713) About Me  (Show Source):
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7,17,27,...,67, altogether 7

70,71,...,77,...,79, altogether 11

87,97, altogether 2

7 + 11 + 2 = 20

John

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