Question
At first, Barrel Q and Barrel R contained 0.4 ℓ and 1.6 ℓ of water respectively. Some water from Barrel R was poured into Barrel Q with no water spilling over. In the end, there was as much water in Barrel Q as in Barrel R. How much water was poured from Barrel R to Barrel Q?
3 m

Click button first when a symbol is required. X

At first, Barrel Q and Barrel R contained 0.4 ℓ and 1.6 ℓ of water respectively. Some water from Barrel R was poured into Barrel Q with no water spilling over. In the end, there was as much water in Barrel Q as in Barrel R. How much water was poured from Barrel R to Barrel Q?