Answer:
100
Explanation:
We know that there are more goblins than magicians, by 20%.
Thus
be magicians M and goblins G, we have to:
G = 1 * M + 0.2 * M
G = 1.2 * M
M = G / 1.2
Therefore, knowing that in there are a total of 120 elves, replacing:
M = 120 / 1.2
M = 100
So there are 100 magicians in total in the club