Answer
$15.0 \ \Omega$
Work Step by Step
We have
$$
\frac{1}{R}=\frac{1}{R_1}+\frac{1}{R_2}=\frac{1}{20}+\frac{1}{60}=0.05+0.016=0.066
.$$
That is, $$R=\frac{1}{0.066}=15.15\approx15.0 \ \Omega$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 6 - Section 6.8 - Substituting Data into Formulas - Exercises - Page 259: 27
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