Question

King 初中有 $1200$ 名学生。每名学生每天上 $5$ 节课。每位老师教 $4$ 节课。每节课有 $30$ 名学生和 $1$ 位老师。King 初中有多少位老师？

King Middle School has $1200$ students. Each student takes $5$ classes a day. Each teacher teaches $4$ classes. Each class has $30$ students and $1$ teacher. How many teachers are there at King Middle School?

$30$

$32$

$40$

$45$

$50$

答案：E

知识点：双重计数

难度评级：950

解答：

每天共有 $1200 \times 5 = 6000$ 次学生上课。每节课有 $30$ 名学生，所以共有 $\dfrac{6000}{30} = 200$ 节课。

每位老师教 $4$ 节课，所以有 $\dfrac{200}{4} = 50$ 位老师。

所以正确答案是 E。

Each day there are $1200 \times 5 = 6000$ student-class attendances. Since each class holds $30$ students, there are $\dfrac{6000}{30} = 200$ classes.

Each teacher teaches $4$ classes, so there are $\dfrac{200}{4} = 50$ teachers.

Thus, the correct answer is E .

1985 AMC 8 第 23 题

答案：E

难度评级：950

解答：

其他年份的第 23 题