Answer
$21 \ units$
Work Step by Step
The number of units that can be placed is given by dividing the whole area over the unit area as follows
$$
number \ of \ units = \frac{20}{1.2\times 0.79}\approx 21 \ units
.$$
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 12.2 - Quadrilaterals - Exercise - Page 392: 22
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