Elementary Algebra

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

Appendix - Extra Word Problems - Page 523: 14



Work Step by Step

Let the unknown number be $x$. Since, the sum of $x$ and two-thirds of $x$ is 15, we obtain: Step 1: $x+\frac{2}{3}x=15$ Step 2: $ \frac{3x+2x}{3} =15$ Step 3: $ \frac{5x}{3} =15$ Step 4: $5x=3(15)$ Step 5: $5x=45$ Step 6: $x=9$
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