McGraw-Hill Education GRE 2019

Exercise Answers

1. D Plug in numbers:

a = 1

A

B

B

A

Comparison

10(1)^2 = 10

10(–1)^2 = + 10

25(1)^3 = 25

a = –1 25(–1)^3 = – 25

Since there are contradictory relationships between the columns, a relationship

cannot be determined.

2. A Subtract a from both quantities. Quantity A thus equals: (a + 7) – a = 7.
   Quantity B thus equals: (a − 12) – a = −12. 7 > −12, so Quantity A is greater.


3. D Substitute values for c and d.

c = 1

d = 1

A

A

B

C

Comparison

(1 + 1)^2 = 4

(0 + 0)^2 = 0

12 + 1^2 = 2

cd = 0 = 0 02 + 0 (^2) = 0
Since a relationship cannot be determined, the correct answer is D.

4. D Substitute values.

x = 1

A

B

B

A

Comparison

x = –1

2

1

(^2) –1= –2 (^7) –1= –7
7
1
When x is positive, Quantity B is greater. When x is negative, Quantity A is
greater. The relationship cannot be determined.

5. D Since you are given a range for x, you should choose extremes. Let x = 2,
   and then let x = 10.

x = 2

A

C

B

B

Comparison

x = 10

22 + 5 = 92^3 + 1 = 9

102 + 5 = 105 103 + 1 = 1,001

Since different values yield different relationships between the quantities, the

correct answer is D.

170 PART 3 ■ GRE QUANTITATIVE REASONING

02-GRE-Test-2018_107-172.indd 170 13/05/17 11:06 am