Question 919777
45/n -45/(n+5) = .30
45(n+5) - 45n = .3n(n+5)
.3n^2 + 1.5n - 225 = 0
n^2 + 5n - 750 = 0  (Tossing out the negative solution for unit measure)
(n + 30)(n - 25) = 0
n = {{{ highlight_green(25)}}}  students were in the class
And...checking
45/25 = $1.80
45/30 = $1.50