Answer:
7 classmates
Step-by-step explanation:
The last person in the line is in position 35.
The Maria's leading classmate is in the position 35-23+1 = 13.
So, Maria's classmates are from position 13 to 19 (not including herself), and their number is 19-12 = 7 persons.
ANSWER. Maria has 7 classmates (not including herself).
Hope this helps.