2005 AMC 12B 第 4 题
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所有题目均经美国数学协会（MAA）官方合法授权使用。
4.
学年开始时，Lisa 的目标是在全年 次小测中至少 得 A。前 次小测中她有 次得 A。若要达成目标，剩下的小测中她最多有多少次可以低于 A？
At the beginning of the school year, Lisa’s goal was to earn an A on at least of her quizzes for the year. She earned an A on of the first quizzes. If she is to achieve her goal, on at most how many of the remaining quizzes can she earn a grade lower than an A?
答案：B
小提示：
次小测的 是她需要得 A 的次数。
of quizzes is the number of A’s she needs
大提示：
剩下 次中，她还需要 次 A。
She needs more A’s out of the remaining quizzes
解答：
Lisa 至少需要 次 A。
她已经有 次，所以剩下 次中还需要 次 A。
因此最多可以有 次低于 A。
所以正确答案是 B。
Lisa needs an A on at least quizzes.
She has already, so she needs more of the remaining quizzes.
She can earn a lower grade on at most of them.
Thus, the correct answer is B.
其他年份的第 4 题
- 1950 AMC 12
- 1951 AMC 12
- 1952 AMC 12
- 1953 AMC 12
- 1954 AMC 12
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