Question

帮忙做SAT数学题，谢谢

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

Answer 1

设卖牛肉次数为y，价格为a，买咖啡次数为z，价格为c，据题意，得
2a=c （1）
y=3z （2）
ay+cz=9.6 （3）
他球的是咖啡总价，即cz=,
所以要用有cz的式子表示，变形（1)得a=c/2,
吧（1）（2）代入得1.5cz+cz=9.6
2.5cz=9.6
cz=3.84
愿楼主采纳

Answer 2

The customer spent 4.8$, coffee--X ,beef--2X, X=9.6/3=3.2 ,2/3=1/X----X=1.5,,,,1.5*3.2=4.8$
That is the process~~

Answer 3

咖啡单价2p，牛肉就是p，咖啡数量q，牛肉就是3q。总共花了9.6美金，即2p*q+p*3q=9.6，也就是5pq=9.6，pq=1.92
花在咖啡上的钱是2pq=3.84
希望可以帮到你~