Find the Largest common factor of 12 and 42:
Factors of 12: 1, 2, 3, 4, 6, 12
Factors of 42: 1, 2, 3, 6, 7, 14, 21, 42
The largest common factor is 6, so they will be split into 6 groups.
12/6 = 2
42 / 6 = 7
Each group will have 2 coaches and 7 players.