Final answer:
Owner A is selling 160 acres of land, which is the size of the northwest quarter of a section in the U.S. land survey system.
Step-by-step explanation:
The student is inquiring about the amount of land being sold by Owner A, which pertains to the Northwest quarter of a section of land. According to the Land Ordinance of 1785 and subsequent U.S. land regulations, land was divided into townships and further subdivided into sections and quarter sections. A standard section is 640 acres, so a quarter of that section would be 160 acres. Therefore, Owner A is selling 160 acres of land.
The owner A is selling the north west quarter of a section of land. To determine the amount of land being sold, we need to understand the subdivision system used for the land. The land is divided into rectangular townships of six square miles. Each township is further divided into thirty-six sections of 640 acres each. Therefore, the north west quarter of a section would be 160 acres.