Question 41196
20*12=240 thus (20-x)(12-x)=84 or 240-32x+x~2=84 or x~2-32x+156 or

(x-26)(x-6)=0 or x=26 & x=6 inch wide frame

proof (20-6)(12-6)=84 or 14*6=84 or 84=84