Two vessels contains equal number of mixtures milk and water in the ratio 4:2 and 5:1. Both the mixtures are now mixed thoroughly. Find the ratio of milk to water in the new mixture so obtained?	Choose the correct choice from the following answers:
A) 3 : 1  B) 9 : 13  C) 5 : 11  D) 11 : 3  E) 15 : 4

Rationale: "the ratio of milk and water in the new vessel is = ( 4 / 6 + 5 / 6 ) : ( 2 / 6 + 1 / 6 ) = 9 / 6 : 3 / 6 = 3 : 1 answer is a"
Answer: A