#### Answer

$5$

#### Work Step by Step

$20= 2^2 \times 5$
$15 = 3\times5$
So the Great Common Factor is $5$

Published by
Pearson

ISBN 10:
0321726391

ISBN 13:
978-0-32172-639-1

$5$

$20= 2^2 \times 5$
$15 = 3\times5$
So the Great Common Factor is $5$

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