CASED BASED QUESTIONS
During a dance practice in school 6570 students of different school are arranged in a rows such that the number of students in each rows is equal to the number of rows. In doing so, the instructor find out that 9 students are left out. 
(i) How many students are left out in the arrangement? 
(ii) What  is the number of students forming a square
(iii) Fine the number of students in each row of the square .
(iv) How many students must be removed to form a perfect  square arrangement?