Answer: Width of canvas = 9 inches
Area left for painting after painting the border = 70 square inches.
Explanation :
Since we have given that
Area of painting = 108 square inches
Length of canvas = 12 inches
As we know that


So, breadth of canvas = 9 inches .
Now, Chloe paints a 1 inch wide blue border on the canvas.


Hence, remaining area = 70 square inches .