ds - robot work word problem

[ccassel]

Hi,

How would you answer this question?

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 robots z's constant rate and r(y) is the ration of robots 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


Cheers

[maihuna]

r(x) = x/z
r(y) = y/z

asking x,y<z

1. r(x) < r(y) => x<y, assuming z is positive not suff to correlate with z

2. r(y) < 1 => y/z < 1 => y<z not suff to correlate with x

combining : x<y<z and we can answer so C