Basic College Mathematics (9th Edition)

Published by Pearson
ISBN 10: 0321825535
ISBN 13: 978-0-32182-553-7

Chapter 9 - Basic Algebra - Test: 30

Answer

Marcella worked for $11$ hours while Tim worked for $8$ hours.

Work Step by Step

1. Solve for $x$ Let $x = $ Marcella's working time on the room (Tim's time) $+$ (Marcella's time) $= 19$ $(x - 3) + (x) =19$ $x - 3 + x = 19$ $2x - 3 = 19$ $2x = 22$ $x = 11$ 2. Use $x$ to find each person's working time Marcella $= 11$ hours Tim $= (x - 3) = (11 - 3) = 8$ hours
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