2011 AMC 8 第 14 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。
14.
Colfax Middle School 有 名学生，男生与女生的比为 。Winthrop Middle School 有 名学生，男生与女生的比为 。两所学校举办舞会，所有学生都参加。舞会上女生占学生总数的几分之几？
There are students at Colfax Middle School, where the ratio of boys to girls is There are students at Winthrop Middle School, where the ratio of boys to girls is The two schools hold a dance and all students from both schools attend. What fraction of the students at the dance are girls?
小提示：
然后用女生总数除以
Then divide the total number of girls by .
大提示：
根据每所学校的比例求女生人数
Find the number of girls at each school from its ratio.
解答：
女生总数为
学生总数为 ，所以女生所占比例为 。
所以正确答案是 C。
The total number of girls is
There are students total, so the fraction of girls is
Thus, C is the correct answer.
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