In a group of 2100 persons comprising players and their coaches, there is a coach for every fourteen players. How many coaches are there in the group?

There are 140 coaches.

One coach per 14 players means a group of 14 + 1 = 15 people per coach.

Total people = 2100.

Number of coaches = 2100 / 15 = 140.

Players = 140 x 14 = 1960, and 1960 + 140 = 2100 checks out.

Method: divide the total by the group size 15.