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Algebra Difficulty 2.0 Junior Find the answer United Kingdom

A water tank is $\dfrac{5}{6}$ full. When $30$ litres of water are removed from the tank, the tank is $\dfrac{4}{5}$ full. How much water does the tank hold when full?

(A) $180$ litres (B) $360$ litres (C) $540$ litres (D) $720$ litres (E) $900$ litres

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