Question
Beaker P had 3 ℓ of water at first. Linda poured some water from beaker Q to P until beaker P is filled with 7 ℓ of water. There were 1 ℓ of water left in beaker Q. How many litres of water were there in beaker Q at first?
3 m

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Beaker P had 3 ℓ of water at first. Linda poured some water from beaker Q to P until beaker P is filled with 7 ℓ of water. There were 1 ℓ of water left in beaker Q. How many litres of water were there in beaker Q at first?