Answer
$x=55^o$.
Work Step by Step
We know that $\angle 1=\angle 3$ because they are alternate-exterior angles, so
$$3x-50=x+60\Longrightarrow 2x=110$$
and hence $x=55^o$.
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 12 - Section 12.1 - Angles and Polygons - Exercise - Page 388: 22
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