In order to solve for the width (which in turn will help us solve for the area), we need to find a scale.
Since the actual floor is 36 feet in length and the diagram has 9, we know the scale is 36/9, which can be simplified to 4/1.
Since we know that the width, is 32, we just have to divide by 4 to find the scaled down drawing, which will be 8 feet.
8*9 = 72 ft^2