GMAT Quantitative Reasoning Practice Test 5

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Question : 22 of 100

Marks: +1, -0

If

X+Y=2 X-2 Z, X-2 Y=4 Z

and

X+Y+Z=21

, what is the value of

Y I Z

?

$-2$
$-4.5$
$3$
$-1.7$
$2.5$

Solution:

There are three equations with three variables, the solution is:

X=0, Y=42

and

Z=-21

so

Y \/ Z

is -2 .

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