Solution: If there are X rooms on the ground floor of the hotel, then there are X+5 rooms on the second floor, which can be obtained.

(1) is arranged by all people on the ground floor, with 4 people in each room. If there are not enough rooms, then

4X48

(3) All arrangements are made on the second floor, with 3 people in each room. If there are not enough rooms, then

3(X+5)48

Comprehensive 12344, you can get

9.6 < x < 1 1, because x is an integer, then x is 10.

A: There are 10 rooms on the first floor of the hotel.