QA – Placement Quizzes | Mixtures and Alligation | Question 2

A certain quantity of water is mixed with milk priced at Rs 12 per litre. The price of mixture is Rs 8 per litre. Find out the ratio of water and milk in the new mixture.
(A) 3:2
(B) 1:2
(C) 5:2
(D) 2:1


Answer: (B)

Explanation: Cost Price of 1 litre of water = Rs 0.
Cost Price of 1 litre of milk = Rs 12.
Mean Price of Mixture = Rs 8.
According to the Rule of Alligation,
(Quantity of Cheaper):(Quantity of Dearer) = (CP of dearer – Mean Price):(Mean Price – CP of cheaper)
Therefore, Water:Milk = (12-8):(8-0) = 4:8 = 1:2.

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