# SOLUTION: The time necessary T to make an enlargement of a photo negative varies directly as the area of the enlargement. If 108 seconds are required to make a 3-by-4 inch enlargement, find

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 Question 22890: The time necessary T to make an enlargement of a photo negative varies directly as the area of the enlargement. If 108 seconds are required to make a 3-by-4 inch enlargement, find the time required to make a 6-by-8 inch enlargement. A. 384 seconds B. 528 seconds C. 480 seconds D. 432 secondsAnswer by rapaljer(4670)   (Show Source): You can put this solution on YOUR website!Step 1: Write an equation relating the variables using k for a constant: T=kA Step 2: Substitute one complete set of variables and solve for k: T=kA 108 = k*12 Divide by 12: Step 3: Use this value of k to answer the question about T. The question is to find T when A= 6*8 = 48: T=9A T= 9*48 T= 432 seconds, which would be D. R^2 at SCC