The R-Doubled-7 Ranch has a new owner. The 30 animals, all chickens and pigs, are dismayed because they
have heard that he is both foolish and inexperienced. This turned out to be true-not being quite sure what
he was looking for, he checked on the health of his animals by inspecting all of their feet. There were 104
feet in all. How many chickens and pigs are on the ranch?