# CAT Practice : Averages, Ratios, Mixtures

When we mix two mixtures in a particular ratio, we get a third mixture. Given the third mixture how does one find the ratio in which they were mixed.

## Alligation

Q.32: A mixture of 40 litres of milk and water, contains 20% of water. How much water must be added to the above mixture to make the water 25% of the resultant mixture?
1. 3 l
2. 2.33 l
3. 2.67 l
4. 4 l

Choice C. 2.67 l

## Detailed Solution

Focus on water since it is the item of interest in the question.
Therefore,

Therefore,
Mixture: Water = 15:1 = ) $\frac{40}{15}$ litres of water must be added = 2.67 l

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