2020 AMC 12A 第 3 题
先试着解答 2020 AMC 12A 第 3 题，然后核对你的答案与精心整理的解答，解答来自 LIVE by Po-Shen Loh。你也可以参加完整限时模拟考试、查看全部 2020 AMC 12A 解答，或核对答案。
所有题目均经美国数学协会（MAA）官方合法授权使用。
3.
一名司机以每小时 英里的速度行驶 小时，在此期间她的汽车每加仑汽油可行驶 英里。她每英里获得 报酬，唯一开销是每加仑 的汽油。扣除这项开销后，她每小时的净报酬是多少美元？
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?
小提示：
小时内她行驶 英里；求出这段距离的报酬和汽油费用
In hours she drives miles; find her pay and her gasoline cost for that distance
大提示：
用净收入除以 小时，得到每小时的报酬
Divide the net earnings by the hours to get the rate per hour
解答：
小时内她行驶 英里，收入为 。
她用掉 加仑汽油，花费 。
净收入为 ，因此每小时为 。
因此，正确答案是 E。
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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