Question 698514
n, number of students
r, the price or rate per student (variable potentially not needed)



{{{PRICE*STUDENTCOUNT=COST}}}


 
<pre>
               PRICE              COUNT STUDENTS     COST

As Planned     2250/n                n               2250

IF five-more   2250/(n+5)           n+5              2250

DIFFERENCE        5
</pre>

{{{highlight_green(2250/n-2250/(n+5)=5)}}}-------simplify and solve for n.