Question
Capacity of 3 wine glasses = Capacity of 1 pitcher
Capacity of 2 pitchers = Capacity of 1 barrel

Capacity of 3 barrels = Capacity of  _____  wine glasses
4 m

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Capacity of 3 wine glasses = Capacity of 1 pitcher
Capacity of 2 pitchers = Capacity of 1 barrel

Capacity of 3 barrels = Capacity of  _____  wine glasses