Ratio, Proportion

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A mixture of 100 litres of spirit and alcohol contains 25% alcohol. How much more alcohol should be added to the mixture to increase the percentage of alcohol to 30% in the new mixture?

3.33 litres

4 litres

5.67 litres

7.14 litres

Explanation:

Alcohol content in the alcohol to be added = 100%
Therefore, the allegation diagram for this problem can be drawn as:

Therefore, ratio of the mixture to alcohol = 70/5 = 14/1
So, alcohol to be added = 100/14 = 7.14 litres

By: Amit Kumar

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