一道GWD,不知道是答案错还是怎么....

scorpio2rd

Robots X, Y, and Z each assemble components at their respective constant rates.  If r_x is the ratio of robot X’s constant rate to robot Z’s constant rate and r_y is the ratio of robot Y’s constant rate to robot Z’s constant rate, is robot Z’s constant rate the greatest of the three?

(1)     r_x < r_y

(2)     r_y < 1

                  

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C. 我选E....

我觉的通过条件可以知道X和Y的大小...但是不知道Z的....

charlesy

通过(1)可以知道x/z < y/z, 即 x<y, 通过 (2) 可以知道 y/z<1, 即 y<z
通过(1)和(2)可以知道 x<y<z