Study the following information carefully and answer the question given below: A certain number of persons are seated in a row facing north and they b...

Study the following information carefully and answer the question given below:

A certain number of persons are seated in a row facing north and they belong to different cities. E sits sixth to the right of the person from Pune. Two persons sit between the ones from Mumbai and Kanpur. The person from Kanpur sits immediately to the right of S. Two persons sit between the person from Kanpur and E. W sits fourth to the left of S. Three persons sit between P and W, who is from Delhi. P sits third from one of the ends. Q is from Lucknow. The number of persons between P and E is the same as the number of persons between the ones from Mumbai and Lucknow. The person from Lucknow sits to the right of the one from Mumbai. Q sits third to the left of V, who sits at one of the extreme ends. The person who sits immediately to the left of O is from Kolkata. O sits third to the left of Q and is from Kanpur. The person who sits sixth to the right of O is from Banaras.

How many persons sit in this row?