Answer:
If Maria uses 2 parts cream and 3 parts milk, then for every 2 parts of cream, she uses 3 parts of milk.
Since she uses 8 liters of cream, we can find the total volume of mixture by finding the equivalent volume of milk that she used.
To find the equivalent volume of milk, we multiply the volume of cream by the ratio of milk to cream:
8 liters * (3 parts milk) / (2 parts cream) = 12 liters
So Maria used 8 liters of cream and 12 liters of milk for a total volume of 20 liters.