There are 6 cellos, 12 violas, and 21 violins playing in an orchestra concert. mr. johnson wants them to sit in rows and he wants each section to have the same number of rows . what is the maximum number of rows the orchestra would have?

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?