An empty barn is full of spiders. The owner of the barn says that no more than seventy - two legs at a time may live in the barn. The owner says that if all the spiders move out and crickets move in, the rule stays the same. The owner thinks that division can be used to figure out how many spiders or how many crickets can live in the barn without breaking the rule. How can the owner use division to figure out how many spiders or how many crickets can live in the barn?