A milkman uses three vessels for selling milk. The capacity of the vessels are 40 L, 30 L and 20 L respectively. He fills 87.5%, 80% and 90% of the vessels with a mix of milk and water in the ratios 3 : 2, 5 : 1 and 7 : 2 respectively. Find the ratio of the total quantity of milk to that of water carried by him?

31 : 9 5 : 2 35 : 9 7 : 2

7 : 2