A container is fff$\frac{4}{5}$/fff full. After 3 liters of its contents are p...【小站备考】

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A container is

$\frac{4}{5}$ full. After 3 liters of its contents are poured out, the container is

$\frac{3}{4}$ full. How many liters would need to be poured back in to refill the container?_____

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