Algebra: A Combined Approach (4th Edition)

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

Chapter 2 - Section 2.4 - An Introduction to Problem Solving - Exercise Set: 51

Answer

Saturn has 18 moons. Uranus has 21 moons. Neptune has 8 moons.

Work Step by Step

Let $S$ be the number of moons on Saturn. Let $U$ be the number of moons on Uranus. Let $N$ be the number of moons on Neptune. $U=N+13$ $S=2+2N$ $S+U+N=47$ $2+2N+N+13+N=47$ $15+4N=47$ $4N=32$ $N=8$ $U=N+13$ $U=8+13$ $U=21$ $S=2+2N$ $S=2+2(8)$ $S=18$
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