Question 146825
L*w=A
L=w+3 for painting
w*(w+3)=w^2+3w Area of the painting.
(w+2)(w+5)=w^2+7w+10 Area of border and painting combined.
w^2+7w+10-(w^2+3w)=100
w^2+7w+10-w^2-3w=100
4w+10=100
4w=90
w=22.5"
L=25.5"
.
Ed