Classmates queue up to go to see a movie, xiaoming is discharged in plus the 9th person, reciprocal the 10th person, how many fellow student does this team altogether have?
Solution: Xiaoming is discharged in plus the 9th person, the specification has 8 people before him, reciprocal the 10th person, the specification has 9 people at the back of him, plus Xiaoming, the number of this team is:
(9 - 1) + (10 - 1) + 1
8 + of = 9 + 1
= 18 (person)