Question
At first, Barrel C and Barrel D contained 0.3 ℓ and 2.7 ℓ of water respectively. Some water from Barrel D was poured into Barrel C with no water spilling over. In the end, there was as much water in Barrel C as in Barrel D. How much water was poured from Barrel D to Barrel C?
3 m

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At first, Barrel C and Barrel D contained 0.3 ℓ and 2.7 ℓ of water respectively. Some water from Barrel D was poured into Barrel C with no water spilling over. In the end, there was as much water in Barrel C as in Barrel D. How much water was poured from Barrel D to Barrel C?