Question

East Junior High School 和 West Middle School 中，喜欢高尔夫、保龄球或网球的学生百分比如下。East（ $2000$ 名学生）：高尔夫 $30\%$ ，保龄球 $48\%$ ，网球 $22\%$ 。West（ $2500$ 名学生）：高尔夫 $24\%$ ，保龄球 $36\%$ ，网球 $40\%$ 。两校合计，喜欢网球的学生占百分之几？

The percent of students who prefer golf, bowling, or tennis at East Junior High School and West Middle School is as follows. At East ( $2000$ students): golf $30\%$ , bowling $48\%$ , tennis $22\%$ . At West ( $2500$ students): golf $24\%$ , bowling $36\%$ , tennis $40\%$ . In the two schools combined, the percent of students who prefer tennis is

$30\%$

$31\%$

$32\%$

$33\%$

$34\%$

答案：C

知识点：百分数平均数

难度评级：1090

解答：

East 喜欢网球的人数为 $22\%$ 乘以 $2000 = 440$ 人；West 喜欢网球的人数为 $40\%$ 乘以 $2500 = 1000$ 人。

两校合计 $1440$ 名学生喜欢网球，总人数为 $4500$ ，比例为 $\dfrac{1440}{4500} = 32\%$ 。

所以正确答案是 C。

East has $22\%$ of $2000 = 440$ tennis fans, and West has $40\%$ of $2500 = 1000$ .

Together $1440$ of the $4500$ students prefer tennis, which is $\dfrac{1440}{4500} = 32\%$ .

Thus, the correct answer is C .

1996 AMC 8 第 19 题

答案：C

难度评级：1090

解答：

其他年份的第 19 题