Question
Beaker B had 6 ℓ of water at first. Nicole poured some water from beaker C to B until beaker B is filled with 7 ℓ of water. There were 9 ℓ of water left in beaker C. How many litres of water were there in beaker C at first?
3 m

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Beaker B had 6 ℓ of water at first. Nicole poured some water from beaker C to B until beaker B is filled with 7 ℓ of water. There were 9 ℓ of water left in beaker C. How many litres of water were there in beaker C at first?