Discussion

Explanation:

Let Ram replace x litres of 12% solution with 39% solution.

Hence, amount of alcohol in new solution = (27 – x) × 0.12 + x × 0.39 = 27 × 0.12 + x × 0.27

Now, new concentration of the solution is 21%, hence, volume of alcohol = 27 × .21

Hence, 27 × 0.12 + x × 0.27 = 27 × 0.21

Hence, 0.12 + x/100 = 0.21

Hence, x = 9.

Hence, option (b).

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