An oven can cook 3 thin crust pizzas in an hour or 1 deep dish pizza in a hour. If you have one oven, how much time do you need to make 12 thin crust pizzas and 4 deep dish pizzas?

Let's break this down into steps.

~ 12 / 3 = 4

The thin crust pizzas will take 4 hours to cook.

~ 4 x 1 = 4

Simple. The deep dish pizzas will take 4 hours.

~ 4 + 4 = 8

The total is 8 hours.

8 pizzas because 12/3 is 4 (the amount of hours) and 4+4 is 8