Question
At first, Bottle R and Bottle S contained 0.4 ℓ and 4.5 ℓ of water respectively. Some water from Bottle S was poured into Bottle R with no water spilling over. In the end, there was as much water in Bottle R as in Bottle S. How much water was poured from Bottle S to Bottle R?
3 m

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At first, Bottle R and Bottle S contained 0.4 ℓ and 4.5 ℓ of water respectively. Some water from Bottle S was poured into Bottle R with no water spilling over. In the end, there was as much water in Bottle R as in Bottle S. How much water was poured from Bottle S to Bottle R?