What quantity of water should be added to 3 litres of 10% solution of salt, so that it becomes a 5% salt solution ?

What quantity of water should be added to 3 litres of 10% solution of salt, so that it becomes a 5% salt solution ?
1). 1.5 litres
2). 2.7 litres
3). 3 litres
4). Cannot be determined

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