Multiple choice

In one litre of a mixture of alchohal and water, water is 30%. The amount of alchohal that must be add to the mixture so that the part of water in the mixture becomes 15% is -

  1. 1000 ml.

  2. 700 ml.

  3. 300 ml.

  4. 900 ml.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Initial mixture: 1000 ml with 30% water = 300 ml water, 700 ml alcohol. After adding x ml alcohol: total = 1000+x ml, water = 300 ml. For water to be 15%: 300/(1000+x) = 0.15, giving 1000+x = 2000, so x = 1000 ml alcohol needed.

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