[求助]GWD

mrchildchild

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?

(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.

最后一道了~

yycder

D吧 列下方程看下能不能解就行了 我觉得是D

不过我DS通常不太好，你参考一下吧

[此贴子已经被作者于2009/8/17 0:41:51编辑过]

yingS

我选D

条件一 cost per person for 4 is 45刀

total cost is 45*4=180

the first person costs 120 ,and the cost for each 3 additional person is (180-120)/3

ans is 20  SUFFISANT

条件二 cost per person for 2 is 25 more than the corresponding cost for 4

假设the cost for each additional person is x

(120+x)/2 = (120+3x)/4 + 25

ans is 20 SUFFISANT