Question

from square and square roots

Answer 1

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see you need to find number of rows and coloumns
the clue given is that 
number of rows = number of columns 
and such that 16 students are left out 
so , 745 - 16 = 729
now , 729 is a square number and square root of 729 is 27 
the number of coloumns = 27
number of rows = 27
remaining students = 16