Answer
c
Work Step by Step
a. 15 + 5 = 20, which is not 28 gallons.
b. 20 gallons is not 3 times as much as 8 gallons (8x3=24)
c. 21 gallons is 3 times as much as 7 gallons (7 x 3 = 21) and 21+7=28 total gallons
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 4 - Section 4.4 - Systems of Linear Equations and Problem Solving - Exercise Set - Page 318: 6
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