Question

在线等第十一题的详细过程 100分奉上！

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Answer 1

设coffee原价是x，muffin原价y
6x+y=15.35......①
6•(1+10%)x+(1+12%)y=17.06
即：6.6x+1.12y=17.06....②
①×1.12：6.72x+1.12y=17.192..③
③-②得：0.12x=0.132
∴x=1.1
则y=15.35-6×1.1=8.75
∴coffee的新价=1.1×1.1=1.21
muffin的新价=8.75×1.12
=9.8

追答

漏了一步：
1coffee+1muffin=1.21+9.8=11.01

追问

nice

Answer 2

Assume a cup of coffee cost $x, and a dozen muffins cost $y,then we could get 6x+y=15.35 and 6*(1+10%)x+(1+12%)y=17.06.
To calculate x,y we get x=1.1, y=8.75
So the new price of one cup of coffee is (1+10%)x=1.1*1.1=1.21
and a dozen muffins cost(1+12%)y=1.12*8.75=9.8

追问

正确答案是11.多

追答

= =那就是两个的和了。。。（我已经分开来算了一杯咖啡一打面包的价格了。。囧）
1.21+9.8＝11.01