25 cuz 18/3=6 and 22+9=31. 31-6=25
The difference starts off by 7. Then it continues to double. Then the answer is 14, 28, 42. The answer doubles every time.
I would say d. the store gets a new 12-pound cat because it would become and even number of cats so you would have to find the average of cats 6 and 7
