(Trình bày bài giải bài toán sau) Theo kế hoạch thì một xưởng mộc mỗi ngày phải đóng 48 ghế. Nhưng vì mỗi ngày đóng vượt mức 2 cái, nên trước khi hết thời hạn quy định 3 ngày xưởng mộc còn phải đóng 100 cái ghế nữa thì hoàn thành kế hoạch. Hỏi theo kế hoạch thì xưởng mộc đó phải đóng bao nhiêu cái ghế và trong thời hạn bao lâu?

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