Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 1, Equations and Inequalities - Chapter Test - Page 65: 30


$\frac{720}{7}\approx102.86$ minutes

Work Step by Step

In one hour we can wash $\frac{60}{15}+\frac{60}{20}=4+3=7$ windows together. Hence we will need $\frac{12}{7}$ hours to wash twelve windows, which is $\frac{720}{7}\approx102.86$ minutes
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