1.

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

Answer»

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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