Suppose a * * * has a car X.
65X+ 15=(65+5)*(X- 1)
X= 17
That is, * * has 17 cars, and the students are: 65 *17+15 =1120 people.
2. A school participated in the Six-One Cup Primary School Mathematics Competition, and several examination rooms were originally scheduled. If two examination rooms are added, each examination room will just sit 24 people; If two examination rooms are reduced, each examination room will sit exactly 30 people. How many students took part in the competition?
Suppose the original examination room is X.
24*(x+2)=30*(x-2)
x= 18
That is, * * has 24*( 18+2)=480 people.