Question 58821
EQUATION:
original average = new average + $5
500/x = 500/(x+5) +5
100/x = 100/(x+5) + 1
100(x+5)= 100x +x(x+5)
100x+500 = 100x + x^2+5x
x^2+5x-500=0
(x+25)(x-20)=0
x=20 (original number of students)
Cheers,
Stan H.