Final answer:
The question asks for the width of a walkway Mr. Smith plans to build, but there is insufficient information to determine the width from the details provided.
Step-by-step explanation:
Mr. Smith is planning to build a walkway and we need to determine how wide it is. Given the information that w=100 feet and the answer for a different dimension is 1 = 140 feet, there is not enough information to directly calculate the width of the walkway. To find the width of a walkway or any other dimensional measurement, you would typically need more context or relevant numerical information that is specifically about the walkway itself.
Commonly, the width could be related to the length or the perimeter of the area, yet those relationships are not given in the provided data. Therefore, in this situation, we cannot determine the correct width of Mr. Smith's walkway with the information provided. More details about the walkway or the project are necessary to make a conclusive calculation about its width.