2019 AMC 8 第 7 题
先试着解答 2019 AMC 8 第 7 题，然后核对你的答案与视频与精心整理的解答，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 2019 AMC 8 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。
7.
Shauna 参加五次测试，每次满分 分。她前三次成绩是 、 和 。为了五次测试平均分达到 ，另外两次测试中她可能得到的最低分是多少？
Shauna takes five tests, each worth a maximum of points. Her scores on the first three tests are and In order to average for all five tests, what is the lowest score she could earn on one of the other two tests?
小提示：
五次成绩总和必须是
The five scores must total
大提示：
让剩下两次中的一次尽可能高
Make one remaining score as large as possible
视频讲解：
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文字解答：
要让其中一次成绩尽可能低，就让另一次成绩尽可能高。假设 Shauna 第四次测试得 分。
这 次测试的总分为 若五次平均分为 ，总分必须为 ，所以最后一次需要 分。
正确答案是 A。
To minimize one of the scores, we have to maximize the other score. Assume that Shauna gets a on her fourth test.
The sum of the tests is then For an average of Shauna’s test scores must add to This means that she needs to get a on her last test.
Thus, the correct answer is A.
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