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concert tickets In $400,$200 and $100 each are available for

来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/05/15 04:53:54
concert tickets In $400,$200 and $100 each are available for sale.the number of $200 tickets sold is a 4 times as many as that of $400 tickets.the number of $100 tickets sold is 380 more than that of $200 tickets.if the total income from te sale of tickets is $86000,how many $400 tickets are sold?
设200$票为X,有100*(X+380)+200X+400*0.25X=86000.X=120.100$的500张,200$的120张,400$30张.