While driving through the countryside one day I saw a farmer tending his pigs and ducks in his yard. I was curious to know how many of each he had. I stopped the car and inquired. Leaning on the stile jovially, he replied: ”I have altogether sixty eyes and 86 feet between them”. I drove off trying to calculate in my mind the exact number of ducks and pigs he had. What do you think is the answer?