Answer
$\frac{100-y}{20}$
Work Step by Step
LCD is 20.
$5-\frac{y}{20}=\frac{5}{1}-\frac{y}{20}=\frac{5\times20}{1\times20}-\frac{y}{20}=\frac{100}{20}-\frac{y}{20}=\frac{100-y}{20}$
Prealgebra (7th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321955048
ISBN 13:
978-0-32195-504-3
Chapter 4 - Section 4.5 - Adding and Subtracting Unlike Fractions - Exercise Set - Page 272: 12
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