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: 62

Answer

48 pounds of 3 dollar tea 32 pounds of 2.75 dollar tea

Work Step by Step

x will be the amount of the more expensive tea 80-x will be amount of the cheaper tea $\frac{3x+2.75(80-x)}{80}$=2.90 3x+2.75(80-x)=232 3x+220-2.75x=232 0.25x=12 x=48 80-x=80-48=32
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