$\frac{3}{4}$ part of a tank is full of water. When 30 litres of water is taken out, the tank becomes empty.The capacity of the tank is

$\frac{3}{4}$ part of a tank is full of water. When 30 litres of water is taken out, the tank becomes empty.The capacity of the tank is
1). 36 litres
2). 42 litres
3). 40 litres
4). 38 litres

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