Question 9

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?

Solution

Let quantity of acid and water be $$7x$$ and $$3x$$ litres respectively.

According to ques,

=> $$\frac{7x}{3x+4}=\frac{7}{4}$$

=> $$28x=21x+28$$

=> $$28x-21x=7x=28$$

=> $$x=\frac{28}{7}=4$$

$$\therefore$$ Total quantity of acid = $$7\times4=28$$ litres

=> Ans - (A)

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