Luigi bought four pizzas for $80. Each pizza was cut into 5 pieces. How much did each piece of pizza cost, in dollars?
Please answer the following question by reasoning step-by-step.
4
4 pizzas at $80 per pizza is $80 / 4 = $20 per pizza.

If there were 5 pieces per pizza, then each piece was worth $20 / 5 = $4.

.

So, the answer is 4