Question
Suppose you have 60 litres of milk, which you can
purchase at Rs. 35 for every 1.5 litres. How many litres of water should you add to this milk to reduce the cost of the mixture to Rs. 16.67 per litre?Solution
Cost of 1.5 litres of milk = Rs. 35 Cost of 1 litre of milk = 35/1.5 = Rs. 70/3 By Alligation, 
Thus, quantity of water to be added = 2 × (60/5) = 24 litres
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