Question
At first, Barrel H and Barrel J contained 0.7 ℓ and 4.7 ℓ of water respectively. Some water from Barrel J was poured into Barrel H with no water spilling over. In the end, there was as much water in Barrel H as in Barrel J. How much water was poured from Barrel J to Barrel H?
3 m

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At first, Barrel H and Barrel J contained 0.7 ℓ and 4.7 ℓ of water respectively. Some water from Barrel J was poured into Barrel H with no water spilling over. In the end, there was as much water in Barrel H as in Barrel J. How much water was poured from Barrel J to Barrel H?