The document involves adding liquid volumes in liters and milliliters. It has three examples: 1) Adding 1 liter 350 ml to get 1 liter 350 ml 2) Adding 7 liters 80 ml, 4 liters 416 ml, and 2 liters 150 ml to get a total of 13 liters 646 ml 3) Adding 5 liters, 1 liter 600 ml, and 260 ml to get a total of 6 liters 860 ml