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.Com
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 englargement
Answer by edjones(8007) (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
RELATED QUESTIONS
The time necessary T to make an enlargement of a photo negative varies directly as the... (answered by rapaljer)
The time T necessary to make an enlargement of a photo of negative varies directly as the (answered by Boreal)
The time T necessary to make an enlargement of a photo negative varies directly as the... (answered by rfer)
The time needed to make a photo enlargement varies jointly as its length and width. If it (answered by Boreal)
the height of a photo is 4 inches more than its width. After enlargement the height will... (answered by ankor@dixie-net.com)
The number G of gears a machine can make varies directly as the time T it operates. If... (answered by stanbon)
The number G of gears a machine can make varies directly as the time T it operates. If... (answered by checkley75)
the number(G) of gears a machine can make varies directly as the time(t) it operates. If... (answered by Fombitz)
The rules for a photo contest state that entries must have an area no greater than 100cm2 (answered by addingup)