Answer
$59$
Work Step by Step
$L=50
\\X=10
\\I=1$
Note that when a smaller number is written before a bigger number, the smaller number is subtracted to the bigger number.
Thus,
$LIX = 50+(10-1) = 50+9=59$
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 4 - Number Representation and Calculation - 4.4 Looking Back at Early Numeration Systems - Exercise Set 4.4 - Page 241: 19
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