Answer:
2 Pepperoni Pizzas
Explanation:
To find how many pizza's they would buy, we need to take into consideration how many cheese pizza's there are to pepperoni pizzas.
Cheese Pizza 3 : 1 Pepperoni
So if they bought 6 cheese pizza's, they would buy 2 pepperoni pizza's
Cheese Pizza 6 : 2 Pepperoni