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.

条件1 我认为是 45*4-120=60； 60/4=15 充分

条件2 ：设两个人加收的钱为A, 四个人加收的钱为B, (120+2A)/2=(120+4B)/4+ 25 不得其解？

所以我选 A, 我的理解是否有误？

条件1充分,但X=60/3=20.

条件2 (120+X)/2=(120+3X)/4+25,X可以解,也充分 选D