Answer
$21$
Work Step by Step
$.20\times? = 4.2$
$? =$
$4.2 ÷ .20 =$
$4.2 ÷ (20 ÷ 100) =$
$(100 × 4.2) ÷ 20 =$
$420 ÷ 20 =$
$21$
or
$.20x=4.2$
$\frac{.20x}{.20}=\frac{4.2}{.20}$
$x=21$
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 2 - Solving Equations - 2-10 Change Expressed as a Percent - Practice and Problem-Solving Exercises - Page 150: 47
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