# Answer to Question #20478 in Calculus for Riley

Question #20478

The time T necessary to make an enlargement of a photo negative varies directly as the area A of the enlargement. If 168 seconds are required to make a 3-by-7 enlargement, find

the time required for a 5-by-10 enlargement.

the time required for a 5-by-10 enlargement.

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