Question
Beaker M had 3 ℓ of water at first. Nicole poured some water from beaker N to M until beaker M is filled with 9 ℓ of water. There were 7 ℓ of water left in beaker N. How many litres of water were there in beaker N at first?
3 m

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Beaker M had 3 ℓ of water at first. Nicole poured some water from beaker N to M until beaker M is filled with 9 ℓ of water. There were 7 ℓ of water left in beaker N. How many litres of water were there in beaker N at first?