#### Answer

1:3

#### Work Step by Step

The ratio of 7 to 21 is written as 7:21.
Simplify by dividing both sides of the ratio by 7, 1:3.

Published by
Pearson

ISBN 10:
0321955048

ISBN 13:
978-0-32195-504-3

1:3

The ratio of 7 to 21 is written as 7:21.
Simplify by dividing both sides of the ratio by 7, 1:3.

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