40
Depends on where you and those 15 acres are located.
23,040 acres.
The University of Texas (at Dallas) has an area of 500 acres.
268,601, including water.
200 acres
25 acres
It depends on how large the ranch is. A ranch that is only 100 acres may only have 50 cows; "real" ranches that are over 1000 acres in size will have over 500 cows.
640 acres
1500 acres
Approximately 130.4 million acres.
114,500 acres
Austin, TX has a total area of 189,568 acres.