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A mixture contains acid and water in the ratio of 7 : 3. If 4 litres of water is added to it, then the ratio of acid and water becomes 7 : 4. What is the quantity (in litres) of acid in the mixture?
Let quantity of acid and water be $$7x$$ and $$3x$$ litres respectively.
According to ques,
$$\therefore$$ Total quantity of acid = $$7\times4=28$$ litres
=> Ans - (A)
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