Trong ngày sơ kết học kì 1, trường tổ chức phát thưởng cho những học sinh giỏi và khá. Bạn Nga và Hồng đều được nhân thưởng, bạn Nga nhận được 20 quyển vở, Nga cho Hồng 1/10 số vở của mình a. Tính số vở Nga đã cho Hồng b.Biết rằng số vở Nga cho Hồng băng 2/15 số vở Hồng được nhận thưởng

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