Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter R - Section R.1 - Factors and the Least Common Multiple - Exercise Set: 52

Answer

180

Work Step by Step

We can find the LCM by checking which multiple of 20 is also a multiple of 3 and 9. 20 * 1 = 20 20 * 2 = 40 20 * 3 = 60 20 * 4 = 80 20 * 5 = 100 20 * 6 = 120 20 * 7 = 140 20 * 8 = 160 20 * 9 = 180 (= 3 * 60) 180 is the first multiple of 20, 9, and 3, so it is the LCM.
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