Answer
a
Work Step by Step
a. 80 x .10 + 20 x .25 = 8 + 5 = 13
b. 20 x .1 + 44 x .25 = 2 + 11 = 13, but the total number of coins is 20+44=66, which is not 100
c. 60 x .1 + 40 x .25 = 6 + 4 = 10, which is not 13
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: 5
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