Three containers of capacity 20L, 5L and 9L contain mixture of milk and water with milk concentrations 90%. 80% and 70%

Three containers of capacity 20L, 5L and 9L contain mixture of milk and water with milk concentrations 90%. 80% and 70% respectively. The content of three containers are emptied into a large vessel. What is the ratio of milk to water in the resultant mixture?

a) 3:1

b) 41:7

c) 283:57

d) 610:13

Sol:

Milk to water=28.3:5.7

                         =283:57