# SOLUTION: The time T necessary to make an enlargement of a photo negative varies directly as the area A of the englargement. If 30 seconds are required to make a 3-by-5 englargement, find th

Algebra ->  Algebra  -> Proportions -> SOLUTION: The time T necessary to make an enlargement of a photo negative varies directly as the area A of the englargement. If 30 seconds are required to make a 3-by-5 englargement, find th      Log On

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 Algebra: Proportions Solvers Lessons Answers archive Quiz In Depth

 Question 127061: The time T necessary to make an enlargement of a photo negative varies directly as the area A of the englargement. If 30 seconds are required to make a 3-by-5 englargement, find the time required for a 5-by-7 englargementAnswer by edjones(7569)   (Show Source): You can put this solution on YOUR website!3*5=15 5*7=35 Proportion: Let x be time required to develop a 5-by-7. x/30=35/15 30x/30=30*35/15 x=70 sec. . Ed