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	Choose the correct choice from the following:
A) 15 litres
B) 10 litres
C) 30 litres
D) 22 litres
E) 8 litres
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.   Answer is 10 litres.
<result>B</result>
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