The average volume of water in two bottles is 625 ml. The volume of water in one of the water bottles is 4 times the volume of water in the other water bottle. Find the volume of water in each water bottle.
Let the volume of water in one bottle be x ml.
The volume of water in the other bottle is 4x ml.
According to the given information, the sum of the volumes of water in the two bottles is 625 ml.
So, x + 4x = 625
=> 5x = 625
=> x = 625 / 5
=> x = 125
Therefore, the volume of water in one bottle is 125 ml and the volume of water in the other bottle is 4 * 125 = 500 ml.