Answer
$15_{\text{seven}}$
Work Step by Step
Note that $12 \div 7 = 1$ remainder of $5$.
Thus,
$12=(1 \times 7) + (5 \times 1)
\\12=15_{\text{seven}}$
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 - 4.2 Number Bases in Positional Systems - Exercise Set 4.2 - Page 226: 22
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