During the summer, Matthew and Devin starting their own business movie mowing lawns for people in the lake section. Before starting any work, Matthew spends $15 to fill up the gas tank for the lawnmower. The boys agree that each person will earn the same amount after Matthew is reimbursed the money he spent for gas. After a week of work, the boys earn a total of $243. Matthew filled the tank just once. How much did each boy earn.

a. Draw a bar model to represent the situation.

b. Write an equation to represent the situation

c. Use the mode to solve the problem.