A container whose capacity is 60 l contains milk and water in the ratio 3 2 How much quantity of the...........

Quantitative Aptitude ( CCS) Mixture and Alligation

A container whose capacity is 60 l contains milk and water in the ratio 3 : 2. How much quantity of the mixture should be replaced with pure milk so that in the final mixture, ratio of milk to water is 7 : 3?

22 l

20 l

15 l

17 l

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Explanation:

In 60 l of mixture, milk = 3/5 * 60 = 36 l, so water = 24 l
Let x litres of mixture is replaced
So
Remaining Milk after replacement is = 36 – (3/5)*x + x = 36 + 2x/5
So (36 + 2x/5)/60 = 7/10
Solve, x = 15 l

Hence, option 3 is the correct answer.