Một phân xưởng xay xát thóc , theo kế hoạch phải xay xát 1000 tấn thóc trong 40 ngày . nhưng do mỗi ngày phân xưởng này đã xay xát vượt 5 tấn nên chẳng những hoàn thành kế hoạch trước thời hạn mà còn xay xát thêm được 20 tấn nữa . Hỏi phân xưởng đã hoàn thành kế hoạch trước thời gian bao nhiêu ngày ?

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