how do set up a formula/how do you solve

Question

the total square footage of wall space to be painted is 300 square feet. if a gallon of paint covers 240 square feet, how many quarts of paint will be required for the project?

Answer 1

First, you want to get the amount of square feet a quart of paint will cover. A gallon is four quarts. So you need to divide the square feet by four: 240/4=60 square feet covered by one quart of paint.

Next, you want to paint 300 square feet. If you divide the total square feet by the number covered by one quart, you will get the number of quarts. So: 300/60=5 quarts needed.

I didn't set up a formula for this. It really isn't necessary unless your assignment was specifically to set up a formula. ?