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The average (arithmetic mean) of the weights of a father and mother is twice the average of the weights of their 4 children. If the average weight of the 6 family members is 128 pounds, what is the average weight, in pounds, of the 4 children?
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· 相关考点
5.2.1 平均值 2.4.1 百分比所属关系与倍数关系的描述
5.2.1 平均值
2.4.1 百分比所属关系与倍数关系的描述
以上解析由 考满分老师提供。
