Question 123

The cost of pure milk is Rs. 16 per litre. On adding water, the mixture is sold at Rs. 15/litre. In this way the milkman earns 25% profit. What is the ratio of milk and water in the mixture ? Assume the cost of water be Rs 0

Solution
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As the Milkman is making 25% profit on selling milk and water solution at Rs 15 , the Cost price of water and Milk solution is $$\frac{15}{1.25}$$ = Rs 12

let the amount of pure milk be x litre and amount of water mixed with it be y litre.

So using , $$\frac{16x}{x + y} = 12$$

= $$\frac{x}{y} = \frac{3}{1}$$

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