Question
Beaker X had 4 ℓ of water at first. Kathy poured some water from beaker Y to X until beaker X is filled with 9 ℓ of water. There were 4 ℓ of water left in beaker Y. How many litres of water were there in beaker Y at first?
3 m

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Beaker X had 4 ℓ of water at first. Kathy poured some water from beaker Y to X until beaker X is filled with 9 ℓ of water. There were 4 ℓ of water left in beaker Y. How many litres of water were there in beaker Y at first?