Giuseppi’s Pizza had orders for $539 of pizzas. The prices for each size of pizza were as follows: large $18, medium $15, and small $11. If the number of large pizzas was one less than three times the number of medium pizzas, and the number of small pizzas was one more than twice the number of medium pizzas, how many of each size of pizza were ordered?
For this problem, set up an equation in one unknown and solve.