问题标题:
(100%-10%)*x+(100%+5%)*(100-x)=103.2.
问题描述:
(100%-10%)*x+(100%+5%)*(100-x)=103.2.
潘卫东回答:
(100%-10%)*x+(100%+5%)*(100-x)=103.2
解:90%X+105%*(100-X)=103.2
90X+105(100-X)=10320
90X+10500-105X=10320
15X=10500-10320
X=12
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