How much pure alcohol should be added to of strength of strength to make its strength to make its strength ?

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answer is C.

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Detailed Solution

Concept- Here, we must determine how much pure alcohol should be added to the mixture in order to increase its strength over that of the original mixture. To start, we must determine the initial strength of the solution and the initial amount of alcohol present. We must use the initial quantity to determine the final amount of solution using the specified strength. The ratio or quantity stated as a fraction of 100 is called a percentage.
The amount of alcohol in

solution of

strength

Allow the necessary quantity of alcohol to be added.

.
It will result in a rise in solution volume

The amount of alcohol now

and the amount of the solution

.
Then, the strength

Hence, the correct answer is option 3.

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