During a mass drill exercise, 6250 students of different schools are arranged in rows such that the number of students in each row is equal to the number of rows. In doing so, the instructor finds out that 9 children are left out. What is the count of children in each row of the square?

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answer is C.

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Detailed Solution

It is given that during a mass drill exercise, 6250 students of different schools are arranged in rows such that the number of students in each row is equal to the number of rows. In doing so, the instructor finds out that 9 children are left out.
Total number of students = 6250.
Number of students forming a square = 6250 - 9 = 6241.
Here, 6241 pupils form a square where the number of rows equals the number of students in each row.
Let x be the number of students in each row. So, by the given condition,