Answer
550 students
Work Step by Step
Use percent proportion.
$\frac{495}{x}=\frac{90}{100}$ or $\frac{495}{x}=\frac{9}{10}$
Cross products:
$9x=4950$
Divide by 9:
$x=550$
Basic College Mathematics (9th Edition)
by Lial, Margaret L.; Salzman, Stanley A.; Hestwood, Diana L.
Published by
Pearson
ISBN 10:
0321825535
ISBN 13:
978-0-32182-553-7
Chapter 6 - Percent - 6.4 Using Proportions to Solve Percent Problems - 6.4 Exercises - Page 419: 25
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