A mixture contains alcohol and water in the ratio 4 : 3. If 10 litres of water is added to the mixture, the ratio becomes 4: 5. Find the quantity of alcohol in the given mixture	Choose one:  A) 15 litres  B) 10 litres  C) 30 litres  D) 20 litres  E) 8 litres
Let the quantity of alcohol and water be 4x litres and 3x litres respectively   4x/(3x+10)=4/5   20x=4(3x+10)   8x=40   x=5   Quantity of alcohol = (4 x 5) litres = 20 litres.   Answer is 20 litres.
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A mixture contains alcohol and water in the ratio 4 : 3. If 10 litres of water is added to the mixture, the ratio becomes 4: 5. Find the quantity of alcohol in the given mixture