i have found following problem in my combinatorics book.
The superintendent of the Hardluck Elementary School District suggests that the Board of Education meet a $5$ million(dollar) budget deficit by raising average class sizes, from $30$ to $36$ students, a $20$% increase. A district teacher objects, pointing out that if the proposal is adopted, the potential for a pair of classmates to get into trouble will increase by $45$%. What is the teacher talking about?
i am trying to imagine what is proposal of problem,first line states that if number of pupil increases by 6,then there would be $5$ million dollar deficit ,also number of pair classmates which get in trouble would increases by $45$%,so if for $30$ children,pair of classmates in trouble is about x quantity,then for $36$,it would be $x+0.45*x$,but how is this related to combinatorics?please help me