Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter 4 - Section 4.4 - Systems of Linear Equations and Problem Solving - Exercise Set - Page 320: 31

Answer

4.5 liters of 4% solution and 7.5 liters of 12% solution

Work Step by Step

$x+y=12$ $.04*x+.12*y=12*.09$ $.04*x+.12*y=12*.09$ $.04x+.12y=1.08$ $.04x+.12y=1.08$ $25*(.04x+.12y=1.08)$ $x+3y=27$ $x+y=12$ $x+3y=27$ $x+3y-(x+y)=27-12$ $x+3y-x-y=15$ $2y=15$ $2y/2=15/2$ $y=7.5$ $x+y=12$ $x+7.5=12$ $x=4.5$
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