SOLUTION: The amount of paint to cover an object varies directly as the surface area. It takes 5 oz of paint to cover 25 square feet. How much is needed to cover 20 square feet? k= ____

Algebra ->  Surface-area -> SOLUTION: The amount of paint to cover an object varies directly as the surface area. It takes 5 oz of paint to cover 25 square feet. How much is needed to cover 20 square feet? k= ____      Log On


   

Question 1085121: The amount of paint to cover an object varies directly as the surface area.
It takes 5 oz of paint to cover 25 square feet.
How much is needed to cover 20 square feet?
k= _____
P= _____
Any help is appreciated! Thank you very much.
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +k+ = the constant of proportionality
+5+=+k%2A25+
+k+=+1%2F5+
-----------------
Area = +20+ ft2
Let +p+ = ounces of paint needed
to cover +20+ ft2
+p+=+k%2A20+
+p+=+%281%2F5%29%2A20+
+p+=+4+
------------------------
+k+=+1%2F5+
+p+=+4+ oz