In one glass, milk and water are mixed in the ratio 3 : 5 and in another glass they are mixed in the ratio 6 : 1. In what ratio should the contents of the two glasses be mixed together so that the new mixture contains milk and water in the ratio 1 : 1 ?

• A. 20 : 7
• B. 8 : 3
• C. 27 : 4
• D. 25 : 9