Problem:
While eating out, Mike and Joe each tipped their server . Mike tipped of his bill and Joe tipped of his bill. What was the difference, in dollars, between their bills?
Answer Choices:
A.
B.
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E.
Solution:
Since Mike tipped , which was of his bill, his bill must have been dollars. Similarly, Joe tipped , which was of his bill, so his bill must have been dollars. The difference between their bills is therefore .
Answer: .
The problems on this page are the property of the MAA's American Mathematics Competitions