In what proportion must water be added to spirit to gain 20% by selling it at the cost price?
Correct answer: B. 1:5
- A. 2:5
- B. 1:5
- C. 3:5
- D. 4:5
Explanation
If the spirit costs Rs.1 per unit, adding water costing Rs.0 per unit and selling the mixture at Rs.1 per unit gives a 20% gain when water is 20% of the spirit quantity. Hence water:spirit = 20:100 = 1:5. The likely mistake is option a, 2:5, which would give a 40% gain rather than 20%.
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