2020 AMC 12A Problem 3
Below is the professionally curated solution for Problem 3 of the 2020 AMC 12A, from LIVE by Po-Shen Loh. You can also try the full timed exam, view all 2020 AMC 12A solutions, or check the answer key.
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Difficulty rating: 1130
3.
A driver travels for hours at miles per hour, during which her car gets miles per gallon of gasoline. She is paid per mile, and her only expense is gasoline at per gallon. What is her net rate of pay, in dollars per hour, after this expense?
Solution:
In hours she drives miles, earning
She uses gallons, costing
Her net earnings are so her rate is per hour.
Thus, E is the correct answer.
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