Question
At first, Tank N and Tank P contained 0.8 ℓ and 4.1 ℓ of water respectively. Some water from Tank P was poured into Tank N with no water spilling over. In the end, there was as much water in Tank N as in Tank P. How much water was poured from Tank P to Tank N?
3 m

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At first, Tank N and Tank P contained 0.8 ℓ and 4.1 ℓ of water respectively. Some water from Tank P was poured into Tank N with no water spilling over. In the end, there was as much water in Tank N as in Tank P. How much water was poured from Tank P to Tank N?