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The Red Rose Theater sells tickets for $4.50 and $6.00.A tot

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The Red Rose Theater sells tickets for $4.50 and $6.00.A total of 380 tickets
were sold for their last performance of “Mickey the Mouse”.If the sales for the
performance totaled $1972.50,how many tickets were sold at each price?
这是谷歌翻译:红玫瑰剧院售价为4.50和6.00美元门票.一共有380张
成交价为他们的“米奇老鼠”的演出.如果在销售
性能达1972.50美元,有多少门票在每个的价格出售?
假设4.5的a张,6元的b张
那么a+b=380,4.5a+6b=1972.5
解方程,b=175,a=205