First, we must figure out how many ounces of spaghetti sauce Gordon has in total. To do this, we should multiply the number of jars of spaghetti sauce (4) by the number of ounces in each jar (23.9).
4 * 23.9 = 95.6
To find out how many pizzas Gordon can make, we must divide the amount of spaghetti sauce that Gordon has (95.6 ounces) by the number of ounces it takes to make one pizza (4.78).