The first group is for the second group of 8 people.
The second group is for the third group of five people.
The third group is for two people in the first group.
When answering, pay attention to the fact that the number of people in each group should be added up and the other components should be subtracted.
The first group: 8 people split up and 2 people split up. Now there are 25 people, but it used to be 25+8-2=3 1 person.
The second group: 5 people split up and 8 people split up. There are 25 people now, and it used to be 25+5-8=22 people.
The third group: two people separate, five people separate. Now there are 25 people, but it used to be 25+2-5=22 people.
Three groups of 3 1+22+22=75 people.