Intermediate Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-894-7
ISBN 13: 978-0-13417-894-3

Chapter 1 - Section 1.5 - Problem Solving and Using Formulas - Exercise Set - Page 65: 4

Answer

$x=40$

Work Step by Step

Step 1. Let x represent one of the unknown quantities. $x$ = the number Step 2. Represent other unknown quantities in terms of x. $0.30x$ = 30% of itself Step 3. Write an equation in x that models the conditions. $x-0.30x = 28$ Step 4. Solve the equation and answer the question. $x-0.30x = 28$ $0.7x=28$ Divide both sides by 0.7: $x=40$ Step 5. Check the proposed solution in the original wording of the problem. if $x=40$ $x-0.30x = 28$ $40-0.30(40) = 28$ $40-12=28$ $28=28$-->TRUE
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.