作业帮GMAT data sufficiency One kilogram of a certain coffee blend consists of x kilogram of type 1 coffee and y kilogram of type 2 coffee.the cost of the blend is C dollars per kilogram,where C=6.5x+8.5y.Is x0.15(2)C大於等於7.30但我觉得是E
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GMAT data sufficiency One kilogram of a certain coffee blend consists of x kilogram of type 1 coffee and y kilogram of type 2 coffee.the cost of the blend is C dollars per kilogram,where C=6.5x+8.5y.Is x0.15(2)C大於等於7.30但我觉得是E
GMAT data sufficiency
One kilogram of a certain coffee blend consists of x kilogram of type 1 coffee and y kilogram of type 2 coffee.the cost of the blend is C dollars per kilogram,where C=6.5x+8.5y.Is x0.15
(2)C大於等於7.30
但我觉得是E
GMAT data sufficiency One kilogram of a certain coffee blend consists of x kilogram of type 1 coffee and y kilogram of type 2 coffee.the cost of the blend is C dollars per kilogram,where C=6.5x+8.5y.Is x0.15(2)C大於等於7.30但我觉得是E
因为 1 kg的blend 里面含有 x kg 第一种和 y kg 第二种,所以 x+y=1;
则 C=8.5-2x
（1）因为 y>0.15,所以 x<0.85,不能确定 x 与0.8大小关系
（2）8.5-2x>=7.3,解得 x<=0.6 ,可以确定
所以选 B
都说了C=6.5x+8.5y了,应该就是只有这两种,没有别的混合物了,我是这么想的,不知道对不对