一道数学题求教！

angusco · 发表于 2010-4-24 22:23:14

Q3:
Material A costs $3 per kilogram, and material B costs $5 per kilogram.If 10 kilograms of material K consists of x kilograms of material A and y kilograms of material B, is x > y?
(1)y > 4
(2)The cost of the 10 kilograms of material K is less than $40.

答案是C 想不通啊。。。

gabriel1981 · 发表于 2010-4-24 22:36:10

哪儿的题？答案确定准确吗？

angusco · 发表于 2010-4-24 22:39:18

最新13套。。应该是GWD的数学题吧

怎么看都是B啊

oNshOt · 发表于 2010-4-24 22:41:43

Q3:
Material A costs $3 per kilogram, and material B costs $5 per kilogram.If 10 kilograms of material K consists of x kilograms of material A and y kilograms of material B, is x > y?
(1)y > 4
(2)The cost of the 10 kilograms of material K is less than $40.

答案是C 想不通啊。。。

-- by 会员 angusco (2010/4/24 22:23:14)

The cost of the 10 kilograms of material K is less than $40。推出 per kilo<4，so y<5；貌似选B

angusco · 发表于 2010-4-24 22:46:47

The cost of the 10 kilograms of material K is less than $40。推出 per kilo<4，so y<5；貌似选B

-- by 会员 oNshOt (2010/4/24 22:41:43)

恩应该就B了条件1怎么看都没用啊

一道数学题求教！

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