Question

In a 60 litre of mixture contains 15% of water and the rest is milk.The amount of milk that must be added so that the resulting mixture contains 87.5% of milk

Answer 1

15% of 60 is 9

therefore mixut3 contains 9litre water and 51 litre milk.... Further i solved in below image.

Answer is 12 litre

Hope u understand..

Cheers