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标题: [求助]请教一道 prep 数学! [打印本页]

作者: sweetcorns 时间: 2007-2-9 06:48 标题: [求助]请教一道 prep 数学!

sophia put amount of money into each of 2 investment A and B, simple annual interest. If annual interest of investment B is 1.5 time that of investment A, what amount did sophia put into investment A?

1 interest for 1 year is $50 for investment A and $150 for investment B

2 the amount that sophia put into investment B is twice the amount that she put into investment A

请教大家,这道题目选E 我认为是C

作者: bluespecter1 时间: 2007-2-9 13:20

两个条件等价，都只能告诉你B是A的两倍，并不能知道具体数字。选E。

作者: sweetcorns 时间: 2007-2-9 19:38

啊,对啊

我一开始列了式子A*x%=50 B*1.5%=150

加上第二个条件,我以为2A*1.5x%=150就可以解出来呢 ,没有想到是等价啊

真狡猾!!!

大家一定要提防敌人的陷阱啊,不要像我一样

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