Bel-Art Polypropylene Book Bottle, 5 Liters (1.25 Gallons), 3 7/16 x 9 1/2 x 14 3/4"
Physics for +2 level - You have two gallons of capacity 12 liters and 5 liters. How can you pour exactly 9 liters of water into 12 liters gallon in the minimum number of steps? | Facebook