Sonia  is 8th from left end and Preeti is 15th from right end . If there are total 27 students in row . Find how many students are between Sonia  and Preeti.

4

Total number of students in a row = rank of Sonia from left end + Rank of  Preeti from right end + number of students between Sonia and Preeti

 27= 8 + 15 + number of students between  Sonia and Preeti

number of students between  Sonia and Preeti = 27 - 23 = 4