Option-1:
x=3y/4
We cannot get any relation for z/y^2 which is asked.
NOT SUFFICIENT
Op-2:
z=2x/3
Again, no relation with the ques.
NOT SUFFICIENT
Together
Comparing the value of x from both the eqns, we get
y=2z
Substitute in z/y^2 which gives a value 1/4z
Its variable and cannot get a definite value.
NOT SUFFICIENT.
Thus ans is [spoiler]"E"[/spoiler]
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Source: Beat The GMAT — Data Sufficiency |
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