Question 9
Farmer Ben has only ducks and cows. He can not remember how many of each he has. Well, he does not need to remember because he knows he has 22 animals and that 22 is also his age. He also knows that the animals have a total of 56 legs, because 56 is also his father’s age. Assuming that each animal has all legs intact and no more, how many ducks does Farmer Ben have?