2. 外语
  3. The ratio of girls to boys in a class is 3 to 4. If there are a total of 28 students in the class, how many girls are there?

The ratio of girls to boys in a class is 3 to 4. If there are a total of 28 students in the class, how many girls are there?

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问题 The ratio of girls to boys in a class is 3 to 4. If there are a total of 28 students in the class, how many girls are there?
选项 A、12
B、16
C、6
D、24
E、21
答案A
解析 班级里女生对男生的比例是3：4，那么女生在班级里所占的比例是3/7，3/7×28=12，所以选择A。
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