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: 57

Answer

18 grams

Work Step by Step

Total amount of alloy is 5 times 18 gram ring = 90 grams Content of silver in the alloy is 10% and we want 25% content (75% gold content) and we will be adding 100% pure silver 1 times x (1 represents 100% and x is the amount of pure silver in grams) 0.1(90)+1x=0.25(90+x) 9+x=22.5+0.25x 0.75x=13.5 x=18
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