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 :
A12 ltrs
B20 ltrs
C22 ltrs
D10 ltrs
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a: b=2:3, b: c=4: 5, ആയാൽ a : b:c=