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  • A grocery customer spent a total of $9.6 for ground beef and coffee.The coffee cost 2 times as much per pound as the gro

    A grocery customer spent a total of $9.6 for ground beef and coffee.The coffee cost 2 times as much per pound as the ground beef,and the customer bought 3 times as many pounds of ground beef.How much,in dollars,did the customer spend on coffee
    英語人氣:810 ℃時間:2020-05-20 00:09:21
    優(yōu)質(zhì)解答
    設(shè)賣牛肉次數(shù)為y,價格為a,買咖啡次數(shù)為z,價格為c,據(jù)題意,得
    2a=c (1)
    y=3z (2)
    ay+cz=9.6 (3)
    他球的是咖啡總價,即cz=,
    所以要用有cz的式子表示,變形(1)得a=c/2,
    吧(1)(2)代入得1.5cz+cz=9.6
    2.5cz=9.6
    cz=3.84
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