一道数学题..急求答案.！谢谢.！
theaverageweightof8rocksinapileis15pounds.Anotherrockisadded,andtheaverageweightofthe...
the average weight of 8 rocks in a pile is 15 pounds. Another rock is added, and the average weight of the rocks in the pile increase to 16 pounds. What is the weight, in pounds, of the added rock.?
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16*9-15*8=144-120=24pounds
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