A week is 7 days.
7 days + 3 days = 10 total days.
12 cans per day x 10 days = 120 total cans.
120 cans x 3 liters and 4 ounces = 360 liters and 480 ounces.
480 ounces = 14.195 liters.
360 + 14.195 = 374.195 liters total paint. ( 374 liters and 6.7 ounces)
Round the answer as needed.