Starlight Tree Farm sells Douglas firs and Noble firs. One December they sold 139 more Douglas firs than Noble firs. The total number of trees sold was 377. Which equation could be used to solve for n, the number of Noble fir trees sold?
One possible equation is:
n + (n + 139) = 377
This equation represents the total number of trees sold, which is the sum of the number of Noble firs sold (n) and the number of Douglas firs sold (n + 139). By solving for n, we can determine the number of Noble firs sold.