Solve.
-The time T necessary to make an enlargement of a photo negative varies directly as the area A of the enlargement. If 60 seconds are required to make a 3-by-5 enlargement, find the time required for a 5-by-8
Enlargement.
A) 160 sec
B) 240 sec
C) 200 sec
D) 120 sec

Question

Quizplus · Accepted Answer

The area of the 3-by-5 enlargement is 3 * 5 = 15 square inches. The area of the 5-by-8 enlargement is 5 * 8 = 40 square inches. Since the time varies directly as the area, the time required for the 5-by-8 enlargement is 60 * 40 / 15 = 160 seconds.

Solve. -The Time T Necessary to Make an Enlargement of a a Photo