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.

##### 考题讲解

（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~$\frac{c}{d}$~