Question

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​

Answer 1

Water = 30% in 1 liter = 0.3 liter = 300 ml.

Alcohol = 700 ml

Total new mixture be x ml.

15% of x = 300

x = 2000 ml.

Alcohol added = 2000 - 700 - 300 = 1000 ml