Algebra 1

Published by Prentice Hall
ISBN 10: 0133500403
ISBN 13: 978-0-13350-040-0

Chapter 1 - Foundations for Algebra - 1-8 An Introduction to Equations - Practice and Problem-Solving Exercises: 36

Answer

a=5

Work Step by Step

We must think in our head what times 20 equals 100. In order to do this, we guess low, whole numbers that may be close to 100 when multiplied by 20. 20 times 4 is 80, which is close but a bit low. However, 20 times 5 equals 100, so we know that a=5.
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