Total number of students in the class = 40
Mohan's rank from the beginning = 27th
The relationship between rank from the beginning and rank from the last is:
Rank from last = Total students - Rank from beginning + 1
Substituting the values:
Rank from last = 40 - 27 + 1
Rank from last = 13 + 1
Rank from last = 14
Therefore, Mohan's rank from the last is 14th.
The correct answer is Option 3: 14th