Question 301091
let the width be x

length = x+20

x(x+20) = 1125

x^2+20x-1125=0

x^2+45x-25x=1125

x(x+45)-25(x+45)=0

(x+45)(x-25)=0

x=-45 or x=25


So width = 25

and length = 20+25 = 45