Multiple choice

A milkman makes 20\% profit by selling milk mixed with water at Rs. 9 per litre. If the cost price of 1 litre pure milk is Rs. 10, then the ratio of milk and water in the mixture is

  1. 3:1

  2. 4:1

  3. 3:2

  4. 4:3
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A Correct answer
Explanation

Let milk ratio = m, water ratio = w in the mixture. Cost price of mixture per liter = (10m + 0w)/(m+w) = 10m/(m+w). Selling at Rs. 9 with 20% profit means CP = 9/1.2 = Rs. 7.5. So 10m/(m+w) = 7.5, giving 10m = 7.5m + 7.5w, so 2.5m = 7.5w, m:w = 3:1.

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