AMC8 2025

AMC8 2025 · Q7

AMC8 2025 · Q7. It mainly tests Percent.

On the most recent exam on Prof. Xochi's class, - 5 students earned a score of at least $95\%$, - 13 students earned a score of at least $90\%$, - 27 students earned a score of at least $85\%$, - 50 students earned a score of at least $80\%$, How many students earned a score of at least $80\%$ and less than $90\%$?

在 Xochi 教授班级最近一次考试中， - 5 名学生的成绩至少为 $95\%$， - 13 名学生的成绩至少为 $90\%$， - 27 名学生的成绩至少为 $85\%$， - 50 名学生的成绩至少为 $80\%$，有多少名学生的成绩至少为 $80\%$ 且低于 $90\%$？

(A) \ 8 \ 8

(B) \ 14 \ 14

(D) \ 37 \ 37

(E) \ 45 \ 45

Answer

Correct choice: (D)

正确答案：（D）

Solution

$50$ people scored at least $80\%$, and out of these $50$ people, $13$ of them earned a score that was not less than $90\%$, so the number of people that scored in between at least $80\%$ and less than $90\%$ is $50-13 = \boxed{\text{(D) 37}}$.

$50$ 人得分至少 $80\%$，在这 $50$ 人中，有 $13$ 人得分不小于 $90\%$，因此得分至少 $80\%$ 且小于 $90\%$ 的人数是 $50-13 = \boxed{\text{(D) 37}}$。

Topics

AR.003 Percent