I'd say thats about 1.7 pizzas since the delivery dude prob got hungery on the way.
Linarose, but u forgot about the coefficient of friction between the box and the pizza that removes an amount of cheeze and/or toppings from the pizza, thereby reomoving some of the pizza. Plus the question never specifies WHEN he got the pizzas, so by now they could all have been eaten, or he could have ordered more.
