Horses and pigs have hooves, not “feet,” so they don’t count. Ducks have feet: 2 ducks × 2 feet = 4 feet The farmer has 2 feet. So the total would seem to be 6 feet. But wait—there’s more. The riddle starts with “If a farmer has…”—meaning it’s hypothetical. We can’t assume the animals actually exist. The only confirmed presence?...