Question
The ratio of the quantity of milk to that of water in a
21-liter mixture is 5:2. How much milk should be added to the mixture such that the ratio of milk to water becomes 3:1?Solution
ATQ, Initial quantity of milk in the mixture = 21 × (5/7) = 15 liters Initial quantity of water in the mixture = 21 × (2/7) = 6 liters Let the quantity of milk to be added to the mixture be ‘x’ liters. ATQ, 
Or, 15+x = 18 Or, x = 3 Quantity of milk to be added = 3 liters
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