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Correct Answer: 40 litres
According to question, If tank has 4x litres of total capacity and it holds 3x litres of water and, if 30 litres of water is taken out, then tank becomes empty. It mean 3x litres of water is taken out
3x=30 litres
x=10 litres
∴capacity of tank
=4x=4×10=40litres