Question
At first, Pail N and Pail P contained 0.5 ℓ and 1.5 ℓ of water respectively. Some water from Pail P was poured into Pail N with no water spilling over. In the end, there was as much water in Pail N as in Pail P. How much water was poured from Pail P to Pail N?
3 m

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At first, Pail N and Pail P contained 0.5 ℓ and 1.5 ℓ of water respectively. Some water from Pail P was poured into Pail N with no water spilling over. In the end, there was as much water in Pail N as in Pail P. How much water was poured from Pail P to Pail N?