A 12-slice pizza was made with only pepperoni and mushroom toppings, and every slice has at least one topping. Only five slices have pepperoni, and exactly eight slices have mushrooms. How many slices have both pepperoni and mushrooms?
12 slices of pizza, and 13 slices have topping. That means there's only 1 slice that has both.
Grrr, I said it wrong. I didn't mean 13 slices have topping. I meant there were 13 applications of topping to 12 slices.