Question 66982
(cost per drum)*(number of drums) = total cost
x/d is the cost per drum
x/d - 5 is the cost per drum less $5
n = number of drums purchased
100 = total cost
(x/d - 5)*n = 100
n = 100 / (x/d - 5) answer
say x = 625
d = 25
n = 100 / (625/25 - 5)
n = 100 / (25 - 5)
n = 100 / 20
n = 5