A milkman dilutes 36 litres of milk with water. The percentage of milk in the solution is now 80%. How many litres of water does he add?
Explanation:
Original milk contains 100% milk. Water contains 0% milk.
Resultant mixture contains 80% milk.
∴ Using Alligation, we are mixing a liquid with 100% milk with another liquid with 0% milk to give a liquid that has 80% milk.
∴ Ratio of Milk and Water = 80 : 20 = 4 : 1
∴ If there are 36 litres of milk
∴ 4 : 1 = 36 : x
∴ x = 9
Hence, option (b).
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