GWD16 35求助啊~~

nicholas81

Q35:
The total charge to rent a car for one day from Company J consists of a fixed charge of $15.00 plus a charge of $0.20 per mile driven.  The total charge to rent a car for one day from Company K consists of a fixed charge of $20.00 plus a charge of $0.10 per mile driven.  Is the total charge to rent a car from Company J for one day and drive it x miles less than $25.00 ?
(1)    The total charge to rent a car from Company K for one day and drive it x miles is less than $25.00.
(2)      x < 50
    
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~~ 我选C是不是答案错啦~~

zsz1990

D啊 俩条件不是等价的么，都能求出x小于50

yli9

提干： j：total charge=15＋0.2mile
          k: total charge=20+0.1m
问： 15＋0.2m<25不?     <＝＝>  问 是不是  m<50 ？
1) TC=20+0.1m<25,  得出m<50  对的
2）x<50对的
所以两个都是对的