Elementary Algebra

Published by Cengage Learning
ISBN 10: 1285194055
ISBN 13: 978-1-28519-405-9

Chapter 7 - Algebraic Fractions - Chapters 1-7 Cumulative Review Problem Set: 59

Answer

75

Work Step by Step

According to the question, 20 percent of a certain number is 15. Therefore, we denote the unknown number with $x$ in order to write the following equation: Step 1: $\frac{20}{100}\times x=15$ Step 2: $20x=100\times15$ Step 3: $20x=1500$ Step 4: $x=\frac{1500}{20}$ Step 5: $x=75$ Therefore, $20$% of $75$ is $15$.
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