In what ratio must water be mixed with milk costing Rs. 12 per liter to get a mixture worth Rs. 9 per liter?

Topic: Ratio and Proportion
Subtopic: Alligation

A1:3

B1:4

C2:3

D3:4

Explanation

Using alligation rule: (Cost of Milk – Mean Price) : (Mean Price – Cost of Water) = (12 – 9) : (9 – 0) = 3 : 9 = 1 : 3.

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