30/100x+70/100【200-x】=200×54/100 解X

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30/100x+70/100【200-x】=200×54/100解X30/100x+70/100【200-x】=200×54/100解X30/100x+70/100【200-x】=200×54/100

30/100x+70/100【200-x】=200×54/100 解X
30/100x+70/100【200-x】=200×54/100 解X

30/100x+70/100【200-x】=200×54/100 解X
30/100x+70/100【200-x】=200×54/100
两边乘以100
30x+70(200-x)=200*54
-40x+70*200=200*54
40x=16*200
x=5*16
x=80