First we will find the area of the wall
The height of the wall = 9 ft
Width of the wall = 10 ft
So area of wall = height*width
area=[tex]9\times10=90[/tex] square feet
And the rest painted area was = 46 square feet
Hence, total painted area = [tex]90+46=136[/tex]
So, a gallon of paint covered 136 square feet area.