SOLUTION: The time T necessary to make an enlargement of a photo negative varies directly as the area A of the enlargement. If 84 seconds are required to make a 3-by-4 enlargement, find the

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Question 383857: The time T necessary to make an enlargement of a photo negative varies directly as the area A of the enlargement. If 84 seconds are required to make a 3-by-4 enlargement, find the time required for a 7-by-6 enlargement.
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
12/84=42/x
12x=3528
x=294 sec, =4.9 minutes