6 teams 5 times the key word is times this means multiply so 6x5=30
the answer would be 10/21
25+30x=65+20x
-20x -25
------ ------
10x=40
10 10
x=4
I crossed multiplied but in a weird way because of how this is. Anyways, I hoped I helped you. :D
Answer:
the representative sample in this situation is 120students in 4 different classes