Question
At first, Barrel L and Barrel M contained 0.7 ℓ and 3.7 ℓ of water respectively. Some water from Barrel M was poured into Barrel L with no water spilling over. In the end, there was as much water in Barrel L as in Barrel M. How much water was poured from Barrel M to Barrel L?
3 m

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At first, Barrel L and Barrel M contained 0.7 ℓ and 3.7 ℓ of water respectively. Some water from Barrel M was poured into Barrel L with no water spilling over. In the end, there was as much water in Barrel L as in Barrel M. How much water was poured from Barrel M to Barrel L?