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    Question

    In a class, Arhin’s rank was 30 from the top and 48

    from the bottom. If his rank became 57 from the top, then what will be his rank from the bottom?
    A 77 Correct Answer Incorrect Answer
    B 78 Correct Answer Incorrect Answer
    C 21 Correct Answer Incorrect Answer
    D 20 Correct Answer Incorrect Answer

    Solution

    Total persons in class = Arhin’s rank from the top + Arhin’s rank from the bottom - 1 = 30 + 48 - 1 = 78 - 1 = 77   If his rank became 57 from the top:   Arhin’s rank from the bottom = Total persons in class - Arhin’s rank from the top + 1 = 77 - 57 + 1 = 20 + 1 = 21   Hence, the correct answer is (C).

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