In Ranking Sequence questions, ranks of a person both from the top and bottom are mentioned and total number of persons is asked. However, sometimes this question is put in the form of a puzzle of interchanging seats by two persons.

Ravi is 7 ranks ahead of Sumit in a class of 39. If Sumit`s rank is seventeenth from the last, what is Ravi`s rank from the start ?

A. 14th
B. 15th
C. 16th
D. 17th
Answer: C . 16th

Justification: Sumit is 17th from the last and Ravi is 7 ranks ahead of Sumit. So, Ravi is 24th from the last. Number of students ahead of Ravi in rank = (39 - 24) = 15. So, Ravi is 16th from the start.