Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 6 Rational Exponents and Radical Functions - Cumulative Review Chapters 1-6 - Page 475: 54

Answer

$3500$ lower-level and $6300$ upper-level seats were sold.

Work Step by Step

Let $x$ be the number of lower-level seats sold. Then the number of upper-level seats sold is $9800-x.$ Then our equation is: $35x+(9800-x)25=280000\\35x+245000-25x=280000\\10x=35000\\x=3500$ Thus $3500$ lower-level and $6300$ upper-level seats were sold.
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