Problem:
The student lockers at Olympic High are numbered consecutively beginning with locker number . The plastic digits used to number the lockers cost two cents apiece. Thus, it costs two cents to label locker number and four cents to label locker number . If it costs to label all the lockers, how many lockers are there at the school?
Answer Choices:
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Solution:
The locker labeling requires digits. Lockers through require digits, lockers through require digits, and lockers through require digits. Hence the remaining lockers require digits, so there must be more lockers, each using four digits. In all, there are student lockers.