1. 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?





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  • By: anil on 05 May 2019 02.03 am
    Let quantity of acid and water be $$7x$$ and $$3x$$ litres respectively. According to ques, => $$frac{7x}{3x+4}=frac{7}{4}$$ => $$28x=21x+28$$ => $$28x-21x=7x=28$$ => $$x=frac{28}{7}=4$$ $$ herefore$$ Total quantity of acid = $$7 imes4=28$$ litres => Ans - (A)
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