The amount of paint a painter needs is directly proportional to the area of the object he is painting. If a painter needs g gallons of paint for every s square feet that he paints, what is the total amount of paint that he needs to paint a house in terms of g and s?

Answer 1

If the house has area h, then he will need

(h/s)*g

or, think of it like this

g gal = s ft^2
g/s is the gal/ft^2 needed

So, for a house of area h ft^2, he will need h(g/s)