There are 36 people in the row.
1. Find the distance between Harry and Ben:
* Harry is 8th from the right.
* Ben is 19th from the right.
* Difference in positions = 19−8=11.
2. Find Loin's position from the right:
* Since Ben is exactly in the middle of Harry and Loin, Loin must be another 11 positions further to the left of Ben.
* Loin's position from the right = 19+11=30th from the right.
3. Calculate the total number of people:
* Loin is 30th from the right and 7th from the left.
* Total people = (Left Position+Right Position)−1
* Total people = (7+30)−1=36.