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标题: GWD-1-32 数学请NN指点 [打印本页]

作者: pyrbbb 时间: 2009-9-8 06:55 标题: GWD-1-32 数学请NN指点

Q32:

For a convention, a hotel charges a daily room rate of $120 for 1 person and x dollars for each additional person. What is the charge for each additional person?

[MSOffice1] (1) The daily cost per person for 4 people sharing the cost of a room equally is $45.

(2) The daily cost per person for 2 people sharing the cost of a room equally is $25 more than the corresponding cost for 4 people.

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为什么D正确，

（2）怎么可以推出具有sufficent?

thanks

作者: Snazzy 时间: 2009-9-8 20:44

1，（120+3x)/4=45
2, (120+x)/2=25+(120+3x)/4

作者: pyrbbb 时间: 2009-9-9 06:41

thanks

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