Question
At first, Pot Q and Pot R contained 0.7 ℓ and 2.8 ℓ of water respectively. Some water from Pot R was poured into Pot Q with no water spilling over. In the end, there was as much water in Pot Q as in Pot R. How much water was poured from Pot R to Pot Q?
3 m

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At first, Pot Q and Pot R contained 0.7 ℓ and 2.8 ℓ of water respectively. Some water from Pot R was poured into Pot Q with no water spilling over. In the end, there was as much water in Pot Q as in Pot R. How much water was poured from Pot R to Pot Q?