Question
Evelyn has 2 tanks. Tank L and Tank M are of different capacities. If Tank L is filled by a tap at a rate of 3 litres per minute and Tank M is filled by a tap at a rate of 5 litres per minute, when Tank L is completely filled, 6 litres of water flowed out from Tank M. If Tank L is filled by a tap at a rate of 6 litres per minute and Tank M is filled by a tap at a rate of 3 litres per minute, when Tank L is completely filled, Tank M is only half-filled. What is the capacity of Tank M? Express your answer in litres.
3 m

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Evelyn has 2 tanks. Tank L and Tank M are of different capacities. If Tank L is filled by a tap at a rate of 3 litres per minute and Tank M is filled by a tap at a rate of 5 litres per minute, when Tank L is completely filled, 6 litres of water flowed out from Tank M. If Tank L is filled by a tap at a rate of 6 litres per minute and Tank M is filled by a tap at a rate of 3 litres per minute, when Tank L is completely filled, Tank M is only half-filled. What is the capacity of Tank M? Express your answer in litres.