The following question has three statements. Study the question and the statements and decide which of the statement (s) is/are necessary to answer the question.

The percentage of milk in three mixtures A, B, and C is 60%, 75%, and 80% respectively. Find the quantity of water in the resultant mixture.

I)  All three mixtures A, B and C are mixed in the ratio of 1 : 3 : 2 respectively.

II) Quantity of resultant mixture of three mixtures is 60 liters.

III) The ratio of water quantity in three mixtures is 8 : 15 : 24.