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弱弱的问一道数学题~~~谢谢

 

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 equally is $25 more than the corresponding cost for 4 people.

              

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

答案是D,不明白题目的意思,谢谢NN们解答

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1) => 120+3x=45×4  可以解出x
2) => (120+x)/2=(120+3x)/4  也可以解出x

所以D

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第一个条件:(45*4-120)/3=20 sufficient

第二个条件: 设4人入住时每人平均要x,有2*(x+25)=4x x=25 sufficient

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谢谢楼上两问NN~~

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