1985 AMC 8 第 5 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。
5.
某数学班最近一个评分阶段的成绩如下： 名学生得 A， 名得 B， 名得 C， 名得 D， 名得 F。如果 A、B、C、D 都是及格成绩，那么及格成绩占全部成绩的几分之几？
The grades in a mathematics class for the last grading period were: students earned an A, earned a B, earned a C, earned a D, and earned an F. If A, B, C, and D are satisfactory grades, what fraction of the grades are satisfactory?
小提示：
把及格成绩 A、B、C、D 的人数加起来
Add the counts for the satisfactory grades A, B, C, and D
大提示：
用及格人数除以总人数
Divide the satisfactory count by the total number of grades
解答：
及格成绩共有 个，总成绩数是 。
所以及格成绩所占的分数是 。
所以正确答案是 C。
The satisfactory grades number and the total number of grades is
So the fraction that is satisfactory is
Thus, the correct answer is C .
其他年份的第 5 题
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