一群7岁的孩子跟一群11岁的孩子同去公园.如果两群小孩合在一起的年龄平均数是9.4岁,那么每群小孩的个数是多少?
分别是4个和6个嘛~
其实人数比应该是2:3,因为是一群,所以排除掉2个人,因此我的答案是4个和6个
英语翻译a group of 7-year-olds are going to a park with a group
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