Answer
$\frac{12}{unknown}$=$\frac{20}{100}$
Work Step by Step
The whole number of injections is unknown. 12 is the part, and 20 is the percent.
Basic College Mathematics (10th Edition)
by Lial, Margaret L.; Salzman, Stanley A.; Hestwood, Diana L.
Published by
Pearson
ISBN 10:
0134467795
ISBN 13:
978-0-13446-779-5
Chapter 6 - Percent - 6.3 Using the Percent Proportion and Identifying the Components in a Percent Problem - 6.3 Exercises - Page 407: 37
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