Answer
12.8 gallons
Work Step by Step
We use $x$ to represent the amount he got during his first stop. Doing this, it follows:
$$ x+2x=19.2 \\ 3x=19.2 \\ x=6.4$$
Thus, during the second stop, he got:
$$=6.4\times 2 = 12.8\ Gallons$$
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 5 - Polynomials and Factoring - 5.5 Factoring Sums or Differences of Cubes - 5.5 Exercise Set - Page 339: 50
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