The volume of a jug is 4 L. The volume of a flask is 3 L more than the volume of the jug. Find the volume of 2 jugs and 3 flasks.
Jug: 4 liters
Flask: 7 liters
2 jugs: 8 liters
3 flasks: 21 liters
21 + 8 = 29 liters