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?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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