Question

下面的饼图显示了 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。East 的学生总数为 $2000$ ，West 的学生总数为 $2500$ 。两校合计，喜欢网球的学生占百分之几？

The pie charts below indicate the percent of students who prefer golf, bowling, or tennis at East Junior High School and West Middle School. The total number of students at East is $2000$ and at West, $2500.$ 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

小提示：

分别求每所学校实际有多少名学生喜欢网球，而不是只看百分比。

Find the actual number of tennis fans at each school, not just the percents

大提示：

把两校喜欢网球的人数相加，再除以总人数 $4500$ 。

Add the two counts and divide by the total of $4500$ students

解答：

East 喜欢网球的人数为 $0.22 \cdot 2000 = 440$ 人；West 喜欢网球的人数为 $0.40 \cdot 2500 = 1000$ 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 $0.22 \cdot 2000 = 440$ tennis fans, and West has $0.40 \cdot 2500 = 1000.$

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

小提示：

大提示：

解答：

其他年份的第 19 题