Câu 1: 2/7 số bi của Hùng là 6 viên. Thế thì Hùng có bao nhiêu viên bi?

Câu 2: 3/5 số học sinh của lớp 6A là 27 bạn. Hỏi lớp có bao nhiêu học sinh?

Giải theo cách Tiểu học giúp mình nha! Mai sở lên dự giờ rồi!

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