Bài 1: Có hai thùng gạo. Thùng thứ nhất chứa 80kg, thùng thứ hai chứa 60kg. Nếu lấy từ thùng thứ nhất một lượng gạo gấp ba lần lượng gạo lấy ra ở thùng thứ hai thì lượng gạo còn lại ở thùng thứ hai gấp đôi lượng gạo còn lại ở thùng thứ nhất. Hỏi lượng gạo còn lại ở mỗi thùng là bao nhiêu kilogram?

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