Question
At first, Tank S and Tank T contained 0.4 ℓ and 1.8 ℓ of water respectively. Some water from Tank T was poured into Tank S with no water spilling over. In the end, there was as much water in Tank S as in Tank T. How much water was poured from Tank T to Tank S?
3 m

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At first, Tank S and Tank T contained 0.4 ℓ and 1.8 ℓ of water respectively. Some water from Tank T was poured into Tank S with no water spilling over. In the end, there was as much water in Tank S as in Tank T. How much water was poured from Tank T to Tank S?