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ds - robot work word problem

Expert replies
by ccassel » Wed Apr 06, 2011 10:44 am
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


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Source: — Data Sufficiency |

by maihuna » Wed Apr 06, 2011 11:28 am
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
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