Answer
The correct answer is (a).
Work Step by Step
Since the two coffees (say, $x$ and $y$) must add up to 100, we have $x+y=100$. Then, coffee $y$ would be $100-x$.
College Algebra (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0321979478
ISBN 13:
978-0-32197-947-6
Chapter 1 - Section 1.7 - Problem Solving: Interest, Mixture, Uniform Motion, Constant Rate Job Applications - 1.7 Asses Your Understanding - Page 140: 6
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