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1. In a 729 litres 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:

Solution:
Quantity of milk in 729 litre of mixture
= 7 × 7299 = 567 litre
Quantity of water
= 729 - 567
= 162 litres
Let x litre of water be added to become ratio 7 : 3
Alligation mcq Solution 2
Or, 73 = 567162+x
Or, 162 × 7 + 7x = 567 × 3
Or, 7x = 1701 - 1134 = 567
Or, x = 5677 = 81 litres water is to be added.

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