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.

If Atul finds that he is twelfth from the right in a line of boys and fourth from the left, how many boys should be added to the line such that there are 28 boys in the line ?

A. 12
B. 13
C. 14
D. 20
E. None of these
Answer: B . 13

Justification: Clearly, number of boys in the line = (11 + 1 + 3) = 15. .'. Number of boys to be added = 28 - 15 = 13.