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.
In a queue of children, Kashish is fifth from the left and Mona is sixth from the right. When they interchange their places among themselves, Kashish becomes thirteenth from the left. Then, waht will be Mona's position from the right ?
Since Kashish and Mona interchange places, so Kashish's new position (13th from left) is the same as Mona's earlier position (6th from right).
So, number of children inn the queue = (12 + 1 + 5) = 18.
Now, Mona's new position is the same as Kashish's earlier position i.e., fifth from left.
.'. Mona's position from the right = (18 - 4) = 14th.