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?
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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