A mixture of 90 litres is to be distributed where milk and water are in the ratio of 7 ∶ 2. If 10 litre milk and 5 litre water will be added in the mixture, then what will be the new ratio of water and milk?
1
5 : 16
2
9 : 5
3
16 : 9
4
16 : 5
5
None of these