Milkman can allow water in milk in the ratio 1 : 4 to ensure quality. He has two samples of milk and water mixtures. First one has water and milk in the ratio 1 : 5 and the second one has water and milk in the ratio 2 : 3. In what ratio should the first and the second samples have to be added to ensure the quality?
1
5 : 1
2
6 : 1
3
3 : 2
4
4 : 1