题目内容：
在一个车厢里，目前的男女生比例是2：5，假如增加四个男生后，男女生的比例变成2：3，则车厢里共有多少个女生？
参考答案：
答案解析：
单选题：在一个车厢里，目前的男女生比例是2：5，假如增加四个男生后，男女生的比例变成2：3，则车厢里共有多少个女生？
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