Hello! This is a geometry question pertaining to Angle Pairs. I'm having trouble solving a question like this, can you possibly explain it to me? Thank you!

Arestaurant offers delivery for their pizzas. the total cost the customer pays is the price of the pizzas, plus a delivery fee. one customer pays $23 to have 2 pizzas delivered. another customer pays $59 for 6 pizzas. how many pizzas are delivered to a customer who pays $86?