Question
At first, Barrel R and Barrel S contained 0.7 ℓ and 3.2 ℓ of water respectively. Some water from Barrel S was poured into Barrel R with no water spilling over. In the end, there was as much water in Barrel R as in Barrel S. How much water was poured from Barrel S to Barrel R?
3 m

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At first, Barrel R and Barrel S contained 0.7 ℓ and 3.2 ℓ of water respectively. Some water from Barrel S was poured into Barrel R with no water spilling over. In the end, there was as much water in Barrel R as in Barrel S. How much water was poured from Barrel S to Barrel R?