McGraw-Hill Education GRE 2019

QUANTITY A QUANTITY B

6. A B C D

b > a > 0

QUANTITY A QUANTITY B

7. A B C D

a, b, and c are positive integers

QUANTITY A QUANTITY B

8. A B C D

Exercise Answers

Discrete Quantitative Questions

1. C The sum of Bob’s three test scores = A × N = 83 × 3 = 249. His score for the
   two given tests = 166. His score for the third test is thus 249 – 166 = 83.


2. C The sum of Janet’s four test scores = A × N = 75 × 4 = 300. The sum of her
   first two test scores = 63 + 83 = 146. The sum of her last two test scores thus
   equals 300 – 146 = 154. Her average for these last two tests = NS =^1542 = 7 7.


3. A Use the average formula for both sets.
   A = NS
   a + b 2 = 70
   a + b = 14 0
   A = NS
   a + c 2 = 100
   a + c = 200
   Now set up a system of equations to solve for b – c:
   a + b = 14 0
   –(a + c = 200)
   ↓
   a + b = 14 0
   
   
   • a – c = –200
     ↓
     b – c = –60
   
   
   
   

The average of 2, 19,

34, and 60

The average of 0, 2,

19, 34, and 60

The average of the

reciprocals of a and b

(b + a)/ab

The standard

deviation of a, b, and c

The standard deviation

of 2a, 2b, and 2c

336 PART 4 ■ MATH REVIEW

04-GRE-Test-2018_313-462.indd 336 12/05/17 12:03 pm