Question 1161835
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The last person in the line is in position 35.


The Maria's <U>leading</U> 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.


<U>ANSWER</U>.  Maria has 7 classmates  (not including herself).
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Solved.