English: Two solutions to the water-pouring problem to obtain 4 litres using 8, 5 and 3-litre jugs using a barycentric plot by CMG Lee. The yellow parallelogram denotes combinations achievable with the given jugs. Starting at the square, the solid red and dashed blue paths show the transitions available by pouring. When a vertex lands on the dotted black triangle denoting 4 L amounts, the puzzle is solved. If needed, another pour to the diamond yields 4 L in each 8 and 5 L jugs.