In a row Rahul is 13th from left end karan is 16th from right end. kamal is right to Rahul. If there are 7 persons between them . Then how many persons are there in the row. 

36

Total number of persons in the row= Position of Rahul from left + Position of Karan from right + persons in between Rahul and Karan 

                                                  = 13 + 16 + 7 

                                                  = 36