Five pizzas were ordered for a company lunch. During the lunch, 75% of the pizzas were eaten. If each pizza had 12 slices, how many slices of pizza were NOT eaten during the lunch?
There were 5 pizzas, so there were a total of 5 * 12 = 60 slices of pizza.
75% of the pizzas were eaten, so 75% of 60 slices is 0.75 * 60 = 45 slices.
Therefore, 60 - 45 = 15 slices of pizza were NOT eaten during the lunch.