扫描二维码，直接登录
题库 / OG2017Q-DS-200
What is the ratio of c to d ?
(1) The ratio of 3c to 3d is 3 to 4.
(2) The ratio of c + 3 to d + 3 is 4 to 5.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
题目分析：
题目需要求~$\frac{c}{d}$~
（1） 条件1得~$\frac{3c}{4d}=\frac{3}{4}$~，所以~$\frac{c}{d}$~，题目得解。
（2） 条件2得~$\frac{c+3}{d+3}$~，无法求得~$\frac{c}{d}$~
因此，本题答案为（A），仅条件1可以解题，条件2不行。
这道题答案是不是有问题，条件2得（c+3)/(d+3)=4/5啊，怎么求不出来
Statement 2: c+3/d+3 = 4/5
4c + 12 = 5d + 15
4c - 5d = 3
登录 或 注册 后可以参加讨论