A new species of wolf was just introduced into an environment that already contained rabbits and foxes. The wolves are better hunters, but there are fewer of them. Each wolf catches an average of 1.8 rabbits per day, while each fox only catches an average of 1.6 rabbits per day. Yet there are three times as many foxes as wolves. The rabbit population began at 13,800. Fifteen days later, that population has dropped to only 12,150. How many foxes are in the environment? How many wolves?