Pure milk costs ₹16 per litre. After adding water the milkman sells the mixture ₹15 per litre and thereby makes a profit of 25%. In what respective ratio does he mix milk with water?
Solution
If the selling price of 1 L is 15 and he makes a profit of 25%, then Cost Price to him for 1 L of mixture = 15/1.25 = 12.
It means that the milkman is adding 12 rupees worth of milk in 1 L of mixture i.e. 12/16 = 3/4 L.
Remaining 1/4 L is water in the mixture.
So, ratio of milk and water in the mixture = 3:1.
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