请教一道GWD DS 题！

cyt1111111

                                    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?

(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 equallyis$25 more than the corresponding cost for 4 people.                                    

                                    

• AStatement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
• BStatement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
• CBOTH statement TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
• DEACH statement ALONE is sufficient.
• EStatements (1) and (2) TOGETHER are NOT sufficient.          答案是D，我觉得应该是A 啊？
  

mengxi0910

是D， 2） 120+X = (120+3X)+25 也可以求X

mengxi0910

不好意思打错了。。 2) （120+X)/2=[(120+3X)/4] + 25

cyt1111111

D怎么翻译呢？

wldhdq

cyt1111111 发表于 2015-5-30 11:25
D怎么翻译呢？

任何一个条件都能满足题意

wldhdq

这道题目的确是D
（1）可以通过 （120+3x)/4=45 解出x   X=20
（2）可以通过（120+x)/2=[(120+3x)/4] +25 解出x  X=20