标题: 请问GWD的5套-3题的答案? [打印本页]
作者: linlin2008 时间: 2005-3-25 08:37 标题: 请问GWD的5套-3题的答案?
Material A cost $3 per kilogram, and material B cost $5 per kilogram.
If 10 kilogram of material K consist of x kilogram of material A
and y kilogram of material B, is x>y?
(1)y>4
(2)The cost of 10 kilogram of material K is less than $40.
看到的答案都不一样呢?到底是什么呢?
作者: himba 时间: 2005-3-25 08:39
我选B
(1)x=5,y=5 ;x=4,y=6......所以不充分
(2) 3x+5y<40
x+y=10
=> y<5 (因为当y>=5时,x=10-y<=5, 3x+5y>=40) => x>y 故充分
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