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2 năm trước
Lâm có một số phong bì đựng tiền xưa loại 1 đồng, 5 đồng, 10 đồng, 20 đồng. Mỗi phong bì chỉ đựng một tờ. Số phong bì 1 đồng gấp 5 lần số phong bì loại tờ 5 đồng. Số phong bì loại 1 đồng gấp 10 lần số phong bì 10 đồng. Số phong bì 10 đồng gấp đôi số phong bì loại tờ 20 đồng. Tìm số tiền xưa ít nhất mà Lâm sưu tầm được.
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