Abby and Mariam are in charge of the annual pizza party. In…

Abby and Mariam are in charge of the annual pizza party. In the past, they’ve always ordered 12-inch-diameter round pizzas, and each 12-inch pizza has always served 6 people. This year, the jumbo 18-inch-diameter round pizzas are on special, so Abby and Mariam decide to get 18-inch pizzas instead. How many people should a 18-inch-diameter pizza serve if a 12-inch-diameter pizza serves 6?