một tàu chở 930 tấn gạo xuất khẩu gồm hai loại là gạo nếp và gạo tẻ. Trong đó số gạo tẻ chiếm 4/5 tổng số gạo. a) tính số tấn gạo tẻ. b) tính tỉ số phần trăm của số gạo nếp so với số gạo tẻ

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