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一所中学的初三年级共有300名学生参加2013年物理、化学实验技能测试。学校把这些学生分成四个组进行现场操作测试,一、二两组的学生数之和占学生总数的7/15,二、三两组的
In the third grade of a middle school, a total of 300 students participated in the 2013 physical and chemical experiment skills test. The school divided the students into four groups for on-site operation tests. The sum of students in groups one and two accounted for 7/15 of the total number of students. Groups two and three