Elementary Geometry for College Students (7th Edition)

Published by Cengage
ISBN 10: 978-1-337-61408-5
ISBN 13: 978-1-33761-408-5

Chapter P - Preliminary Concepts - P.1 - Sets and Geometry - Exercises P.1 - Page 7: 37

Answer

84 books

Work Step by Step

To find the number of books he reshelfed, we must add the number of books he put on a shelf in either category and then must subtract the number of books in both categories to avoid double counting them. Doing this, we find: $$ = 69+47-32 \\ =69+15 \\ = 84$$
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