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 78: 61

Answer

35%

Work Step by Step

Jill drinks 100mL so we will subtract this amount from 750mL (original amount), that is 650mL of 50% juice, she then refills the bottle (up to former 750mL) with 100mL of lower concentration (x) juice, the result is 48% pure juice. We will now solve for x: 0.5(650)+x(100) = 0.48(750) 325+100x=360 100x=35 x=0.35=35%
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