###Human: 10 boxes each contain 50 bottles of water.  Each bottle has a capacity of 12 liters and is filled up to 3/4 of its capacity.  How many liters of water altogether are contained within the bottles in the boxes?, ### Assistant: Since each water bottle has a capacity of 12 liters, when filled up to 3/4 of capacity, each carries 3/4*12 = 9 liters of water.
If there are 50 bottles of water in each box, the number of liters the water bottles in a box are carrying is 50*9 = 450 liters.
In 10 boxes containing bottled water, the total number of liters in the water bottles is 450*10 =4500 liters. 
 So the answer is :  4500