Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 1 - Section 1.7 - Modeling with Equations - 1.7 Exercises - Page 77: 58

Answer

2.4L

Work Step by Step

There are 6L of brine at a concentration of 120g/L That is the concentration of $\frac{720g}{6L}$ We want concentration of 200g/L The amount we need to boil off is x $\frac{720}{6-x}$=$\frac{200}{1}$ 720=200(6-x) 720=1200-200x 200x=480 x=2.4
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