Question
At first, Tank V and Tank W contained 0.4 ℓ and 4.2 ℓ of water respectively. Some water from Tank W was poured into Tank V with no water spilling over. In the end, there was as much water in Tank V as in Tank W. How much water was poured from Tank W to Tank V?
3 m

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At first, Tank V and Tank W contained 0.4 ℓ and 4.2 ℓ of water respectively. Some water from Tank W was poured into Tank V with no water spilling over. In the end, there was as much water in Tank V as in Tank W. How much water was poured from Tank W to Tank V?