Adding and Subtracting Areas

Sheridan and his roommates threw a party and ordered multiple pizzas for the event. The morning after, Sheridan checks the refrigerator for the leftovers. The table above represents the leftovers that were available to eat. If Sheridan is a vegetarian that hates pineapple, how much less pizza can he eat than his roommates, who will eat any kind of pizza? $\\$ Assume each pizza is was ordered as an XL, 16" 12-cut pizza. Round to the nearest square inch.