#### Answer

4

#### Work Step by Step

The proportion is set up as a/5=12/15. To find "a", we must look at the denominators. We had to divide 15 by 3 to get to 5, so we have to divide 12 by 3 to get "a" which is 4.

Published by
Prentice Hall

ISBN 10:
0133186024

ISBN 13:
978-0-13318-602-4

4

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