I don't exactly understand the question, but my guess is that you have a $50 bill, and the pizza pies cost $12.25 dollars each and you want to know how many you can buy. Well, to find that we are gonna have to do the expression below:
50/12.25 = 4.081633. You could get 4 pizza pies with a 50 dollar bill!
I really hope this helps! Have a nice day!! :D