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The weights of the individual boxes in a shipment are listed in the table above, along with the numbers of boxes for three of the weights. The average (arithmetic mean) weight of the boxes weighing 5 or 10 kilograms was 7.5 kilograms. The average weight of the boxes weighing 20 or 40 kilograms was 35 kilograms. What was the total number of boxes that were shipped?
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· 相关考点
5.2.1 平均值
5.2.1 平均值
以上解析由 考满分老师提供。