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

option 1

In 1 litre i.e. $1000$ ml of
mixture,
Alcohol $= 700$ ml.
Water $= 300$ ml.
Let $x$ ml of alcohol is mixed

$\frac{300}{1000+x}\times100$ = 15

$1000 + x = 2000$
 $x = 1000$ ml

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