Q. 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?
A) 22
B) 28
C) 32
D) 20
✔ Correct Answer: 28
Exam Insight
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