4 pizzas at $80 per pizza is $80/4 = $<<80/4=20>>20 per pizza.

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

# Answer

4
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Luigi bought four pizzas for $80.  Each pizza was cut into 5 pieces.  How much did each piece of pizza cost, in dollars?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
4
Luigi bought four pizzas for $80.  Each pizza was cut into 5 pieces.  How much did each piece of pizza cost, in dollars?
train