Double Fellowship?
A and B hold a piece of ground in common, for which they are to pay $36. A put in 23 oxen for 27 days, and B 21 oxen for 35 days; what part of the rent ought each man to pay?
Solution:
As a side note, the text uses this problem to illustrate the application of the rule of "double fellowship," which states:
 Multiply each man's stock into the time of continuance, then say
 As the total sum of all the products is to the whole gain or loss,
 So is each man's particular product to his particular share of the gain or loss.
Any idea what this all means?
Source: Samuel Webber's Mathematics Compiled from the Best Authors, 1808, p. 123.
