Answer:
The length is 6.875 (6.9) ft, the width is 5 ft, and the area is 34.375 (34.5)

Explanation:
If the scale is 4 in to 5 ft, we can simply divide 5 by 4 to find out the scale by which we would multiply one inch. The reason it is 5/4 and not 4/5 is because 5 ft > 4 in. 5/4 = 1.25. 1.25 * 5.5 = 6.875. When rounded to the nearest tenth, it is 6.9. Using the same measurement NOT rounded, it is 34.375, but using the rounded value the answer is 34.5 sqft.
Hope I helped! Also, if this is wrong someone please correct me.