题目应该是这样的.
4袋平均15磅的面粉和4袋5磅的面粉,放在一个架子上,8袋在一起的平均质量是多少?（4*15+4*5）/8=10 选B
一道SAT数学题.if 4 bags of flour with an average weight of 15 pou
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