một công nhân phải làm một số sản phẩm trong 18 ngày.Do đã vượt mức mỗi ngày 5 sản phảm nên say 16 ngày anh đã làm xong và làm thêm 20 sản phẩm nữa ngoài kế hoạch.Tính xem mỗi ngày anh đã làm được bao nhiêu sản phẩm

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