[問題]GWD 10-32

[Flory]

For a convention, a hotel charges a daily room rate of $120 for 1 person and x dollars for each additional person. What's 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.

Ans: D

but I got A. because (2) MORE than the corresponding cost for 4 people. I don't think that (2) alone is sufficient enough. What do you think??

Thanks all!

[zazer.lin]

For a convention, a hotel charges a daily room rate of $120 for 1 person and x dollars for each additional person. What's 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.

Ans: D

but I got A. because (2) MORE than the corresponding cost for 4 people. I don't think that (2) alone is sufficient enough. What do you think??

Thanks all!

statement(2) 的意思是說:
2個人平均分攤的錢會比4個人平均分攤的錢還要多$25, 意即
2個人平均分攤的錢 - 4個人平均分攤的錢 = 25
[(120+1*x)/2] - [(120+3*x)/4] = 25
所以這個一元一次方程式是可以解的出來 x = 20.
故答案(D)應該沒錯!