Question
When 10 litres of water is added to a mixture of milk
and water, the ratio of quantity of milk and water becomes 4:5. Instead, if 20 litres of water had been added, then the ratio of quantity of milk to that of water would become 3:4. Find the quantity of milk in the initial mixture.Solution
ATQ, Let the quantity of milk in the initial mixture be 'x' litres. Since, after the addition of 10 litres of water, the ratio of milk and water becomes 4:5, the quantity of water in the initial mixture will be (5/4)×x−10 litres. 
Therefore, the quantity of milk in the mixture = x = 120 litres.
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