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In a class of 160 seniors, the ratio of boys to girls is 3 to 5. In the junior class, the ratio of boys to girls is 3 to 2. When the two classes are combined, the ratio of boys to girls is 1 to 1. How many students are in the junior class?

单选题
2022-11-03 22:20
A、400
B、360
C、200
D、180
E、160
查看答案
正确答案
C
试题解析

因为这个班共有160人，男生和女生的比例为3:5，所以男生和女生的人数分别为(3/8) ×160 = 60人，(5/8) ×160 = 100人。假设另一班男生女生人数共有x人，那么男生女生的人数分别为(3/5)x，(2/5)x，又因为当两班的人数相加后，男生女生的比例相等，所以可得出60 + (3/5)x = 100 + (2/5)x，经计算，x = 200。
标签： 国外英语考试 美国学术能力评估考试（SAT）
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