Question
At first, Container P and Container Q contained 0.6 ℓ and 3.6 ℓ of water respectively. Some water from Container Q was poured into Container P with no water spilling over. In the end, there was as much water in Container P as in Container Q. How much water was poured from Container Q to Container P?
3 m

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At first, Container P and Container Q contained 0.6 ℓ and 3.6 ℓ of water respectively. Some water from Container Q was poured into Container P with no water spilling over. In the end, there was as much water in Container P as in Container Q. How much water was poured from Container Q to Container P?