Verbal (Pre-Launch)

Target Test Prep Sample GRE Quantitative Comparison Problem

Example 1

2x + 2y = – 4 and z2=x+y

   

Quantity A:

z

Quantity B:

z2

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We must determine the value of z to solve for both Quantity A and Quantity B.  We are given two equations:  2x + 2y = –4 and  z2=x+y.

With these two equations we can produce a unique value for z.  The first equation can be reduced to

x + y = –2. We can substitute –2 for x + y in equation two to yield  z2=-2z=-4. Since z is negative, z2 is greater than z. 

Thus, Quantity B is greater than Quantity A. 

Answer: B
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