A milkman mixed 30 litres of water in 150 liter of milk and sold 30 liter of mixture, after that he mixed milk and water in the ratio 5:6 so quantity. Of milk becomes 150 litre. Then find how much amount water mixed by milkman after sold 30 liter of mixture?

The initial mixture is 150 litres of milk and 30 litres of water, which is 180 litres total in a 5:1 ratio, so selling 30 litres removes 25 litres of milk and 5 litres of water. The remaining mixture has 125 litres of milk and 25 litres of water, and after adding milk and water in a 5:6 ratio, the milk quantity returns to 150 litres. Because the added mixture provides 25 litres of milk (150 minus 125), the corresponding amount of water added is (6/5) * 25 = 30 litres.

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