<image>There are 31 students going on a boat trip.

(1) If they all ride in small boats, how many small boats need to be rented?____
Answer: ___ small boats need to be rented.
(2) How else can the boats be rented? I think another way to rent the boats is: Rent ___ boats with a capacity of 9 passengers, and ___ boats with a capacity of 2 passengers.