A mixture contains alcohol and water in the ratio 4 : 3. If 7 litres of water is added to the mixture, the ratio becomes 4: 5. Find the quantity of alcohol in the given mixture  Options:
A) 15 litres	B) 14 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+7)=4/5   20x=4(3x+7)   8x=28   x=3.5   Quantity of alcohol = (4 x 3.5) litres = 14 litres.   Answer is 14 litres.
<result>B</result>
A mixture contains alcohol and water in the ratio 4 : 3. If 7 litres of water is added to the mixture, the ratio becomes 4: 5. Find the quantity of alcohol in the given mixture