A litre of pure alcohol is added to 6 litres of 30% alcohol

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A litre of pure alcohol is added to 6 litres of 30% alcohol solution. The percentage of water in the solution is

1. 50%
2. 65%
3. 60%
4. 40%

Correct Option: C

In 30% alcohol solution,

Alcohol =	30	× 6 = 1.8 litres
	100

Water = 4.2 litres
On mixing 1 litre of pure alcohol,

Percentage of water =	4.2	× 100 = 60%
	7