Answer
20 decades
Work Step by Step
The prefix dec means ten and the prefix cent means 100. Therefore a decade has 10 years and a century has 100 years.
(2 centuries $\times$ 100 years) $\div$ 10 years = 20 decades
Basic College Mathematics (9th Edition)
by Lial, Margaret L.; Salzman, Stanley A.; Hestwood, Diana L.
Published by
Pearson
ISBN 10:
0321825535
ISBN 13:
978-0-32182-553-7
Chapter 8 - Geometry - Review Exercises - Page 620: 103
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