Question
At first, Barrel S and Barrel T contained 0.5 ℓ and 1.9 ℓ of water respectively. Some water from Barrel T was poured into Barrel S with no water spilling over. In the end, there was as much water in Barrel S as in Barrel T. How much water was poured from Barrel T to Barrel S?
3 m

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At first, Barrel S and Barrel T contained 0.5 ℓ and 1.9 ℓ of water respectively. Some water from Barrel T was poured into Barrel S with no water spilling over. In the end, there was as much water in Barrel S as in Barrel T. How much water was poured from Barrel T to Barrel S?