Algebra: A Combined Approach (4th Edition)

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: 6

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
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