Answer:
Number of goblins in the magic club = 120
Explanation:
Let number of goblins in the magic club be x
Number of goblins and wizards in the magic club are given to be 220
So, Number of wizards in the magic club be 220 - x
There are 20% percent more goblins than wizards in magic club.
⇒ Number of goblins = Number of wizards + 20% of number of wizards
⇒ x = 220 - x + 20% of (220 - x)
⇒ x = 220 - x + 0.2·(220 - x)
⇒ 2·x = 220 + 44 - 0.2·x
⇒ 2.2·x = 264
⇒ x = 120
Therefore, Number of goblins in the magic club = 120