B地运往C镇X吨,运往D镇300-X吨
A地运往C镇240-X吨.运往D镇200-(240-X)=X-40吨
A地运C、D镇费用:
20*(240-X)+25*(X-40)=5X+3800
B地运C、D镇费用:
15x+18(300-x)=5400-3X
运费相等:5X+3800=5400-3X
8X=1600 X=200吨
B地运往C镇X吨,运往D镇300-X吨
A地运往C镇240-X吨.运往D镇200-(240-X)=X-40吨
A地运C、D镇费用:
20*(240-X)+25*(X-40)=5X+3800
B地运C、D镇费用:
15x+18(300-x)=5400-3X
运费相等:5X+3800=5400-3X
8X=1600 X=200吨