Solve the problem. Round your answer to two decimal places.
-The time T necessary to make an enlargement of a photo negative varies directly as the area A of the enlargement. If 72 seconds are required to make a 3-by-4 enlargement, find the time required
For a 6-by-7 enlargement.
A) 336 sec
B) 210 sec
C) 294 sec
D) 252 sec

Question

Quizplus · Accepted Answer

The area of the 3-by-4 enlargement is 12 square units, and the time is 72 seconds. The area of the 6-by-7 enlargement is 42 square units. Since time varies directly with area, we set up the proportion: 72/12 = T/42. Solving for T gives T = 252 seconds.

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