một thửa ruộng hình chữ nhật có chiều dài là 60m và chiều rộng bằng một nữa chiều dài .tính diện tích thửa ruộng đó.Người ta thu hoạch được 50kg thóc.Hỏi trên cả thửa ruộng đó người ta thu hoạch được bao nhiêu tấn thóc?

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