Question
At first, Bottle X and Bottle Y contained 0.7 ℓ and 1.3 ℓ of water respectively. Some water from Bottle Y was poured into Bottle X with no water spilling over. In the end, there was as much water in Bottle X as in Bottle Y. How much water was poured from Bottle Y to Bottle X?
3 m

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At first, Bottle X and Bottle Y contained 0.7 ℓ and 1.3 ℓ of water respectively. Some water from Bottle Y was poured into Bottle X with no water spilling over. In the end, there was as much water in Bottle X as in Bottle Y. How much water was poured from Bottle Y to Bottle X?