Answer:
Explanation:
The unit rate is 400 square feet per gallon.
What is unitary method ?
Unitary method is a mathematical way of deriving a single unit and then finding the required unit by multiplying.
A graph is shown in the diagram and two points are given x co-ordinate represents paint used per gallon and y co-ordinate represents wall painted in square feet.
Given (1/4,100) implies 1/4th of a gallon paint is needed to pain 100 square feet of wall.
∴ In 1 gallon (100)÷1/4 square feet of wall can be painted which is 400 square feet.
And the unit rate is 400 square feet per gallon.