Answer :
Just take 9/9-4/9=5/9, we get 9/9 because that is how much fruit punch that there was when the container was full. Enjoy!=)
Well assuming that the 4/9 means 4/9 L then the answer would be 5/9 because
9/9 - 4/9 = 5/9
9/9 - 4/9 = 5/9