Question
Beaker R had 4 ℓ of water at first. Wendy poured some water from beaker S to R until beaker R is filled with 7 ℓ of water. There were 2 ℓ of water left in beaker S. How many litres of water were there in beaker S at first?
3 m

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Beaker R had 4 ℓ of water at first. Wendy poured some water from beaker S to R until beaker R is filled with 7 ℓ of water. There were 2 ℓ of water left in beaker S. How many litres of water were there in beaker S at first?