A frame that measures 11 inches by 10 inches is of uniform width. The area of the picture inside is 20 square inches. What is the width of the frame?

Answer 1

3 inch wide frame

(11-6)(10-6)=5x4=20 in^2 picture inside

11x10=110

110-20= 90

=2(11-2w)w+ 2(10w)=90

-4w^2 +42w -90=0

2w^2 -21w +45=0

(w-3)(2w-15)=0

w=3