Question 430036
Let X equal the width of our frame. 22-2x equals the area inside the frame that shows a picture (It's 2x because we have frame surrounding both sides of the picture). Likewise, its length is 15-2x, since the width of the frame is consistent throughout.  Thus:

(22-2x)(15-2x)=198
330-74x+4x2=198
4x2-74x+132=0
2x2-37x+66=0
(2x-33)(x-2)=0

If we use x=2, we see our equation works. 22-2x=18, 15-2x=11---so our picture is 18X11, which gives us 198cm2, and our frame is 2cm wide.