請教各位 GWD26- Q31
DS:
One kilometer of a certain coffee blend consists of X kilogram of type I coffee and Y kilogram of type II coffee. The cost of the blend is C dollars per kilogram, where C = 6.5X + 8.5Y. Is X < 0.8?
(1) Y > 0.15
(2) C ≥ 7.30
答案是 (B)
我连题目都看不懂,不晓得那个C是怎么来的...
就说说,1公斤的coffee blend包含有x公斤的 type I 和y公斤的type II,价格C,C =
6.5X + 8.5Y
题中的条件可以得出 X+Y=1,联系两个方程得到X=8.5-C,所以条件2有效,条件1无关
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