There are two ducks in front of a duck, two ducks behind a duck and a duck in the middle. How many ducks are there?
This problem can be thought through in different ways. 
One solution is that there are 5 ducks: One in the middle, two in front of it, and 2 behind it.
Though there is another solution that you might be looking for.
 There are 3 ducks. One in front, one in the middle, and one in the back. The back one has two ducks in front of it, the front duck has two ducks behind it and the middle duck is in the middle thus fulfilling all the requirements.
If you would to pick a solution from these two, which one would you pick and why?