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A mixture contains alcohol and water in the ratio 4 : 3. If 5 liters of water is added to the mixture, the ratio becomes 4: 5. Find the quantity of alcohol in the given mixture.

Correct Answer: 10

Explanation:

Let the quantity of alcohol and water be 4x litres and 3x litres respectively


 


4x/(3x+5) = 4/5 


 


20x = 4(3x+5)


 


8x = 20


 


x = 2.5


 


Quantity of alcohol = (4 x 2.5) litres = 10 litres.


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