Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 1 - Problem Solving and Critical Thinking - 1.3 Problem Solving - Exercise Set 1.3: 60

Answer

Total number of 7's needed = 20

Work Step by Step

Number of 7's in each group of 10 from 1 to 99 = 10 Other than this, there will be 10 additional 7's from 70 to 79 . 10 + 10 = 20 therefore, total no of 7's required = 20
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