Short Answer 
The farmer has a total of 3 horses, 2 ducks, and 1 pig, which sums up to 6 animals. Including the farmer as well, the total count is 7, leading to a final measurement of 22 ft when considering specific lengths attributed to both the farmer and the animals.
Count the Animals
Start by identifying the animals the farmer has. In this case, the farmer has the following:
- 3 horses
- 2 ducks
- 1 pig
Make a note of their contributions to the count, but remember that they alone will not sum to the final count we’re looking for.
Add the Farmer
Next, include the farmer in your count. The farmer is a crucial part of the scenario and adds to the overall total. Thus, by adding this one person to the previous animal count you get:
- 3 (horses) + 2 (ducks) + 1 (pig) + 1 (farmer) = 7
Calculate the Total Length
Now, consider the specific measurement mentioned. The question suggests we’re aiming for a 20 ft total, but by including the farmer in our computation, we deduce that the total count may actually equal:
- 2 ft from the farmer and 20 ft from the animals combined.
Thus, adding these figures leads us to a final total of 22 ft when calculated properly.