In a 729 liters mixture of milk and water , the ratio of milk to water is 7:2 To get a new mixture containing milk and water in the ratio 7:3 the amount of water to be added is -

In a 729 liters mixture of milk and water , the ratio of milk to water is 7:2 To get a new mixture containing milk and water in the ratio 7:3 the amount of water to be added is - Correct Answer 81 liters

Quantity of milk in 729 litres of mixture = 7 × (729/9) = 567 litres, Quantity of water = 729 - 567 = 162 litres Let x litre of water be added to become ratio 7 : 3 Or, 7/3 = 567/(162 + x) Or, 162 × 7 + 7x = 567 × 3 Or, 7x = 1701 - 1134 = 567 Or, x = 567/7 = 81 litres water is to be added.
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