Hi

There are 824 students in school

Let x and (824-x) represent the number of girls and boys respectively

  

Question states***

    | Cross Multiplying 

    5x = 3(824-x)

     8x =2472

      x = 309, the number of girls.  The number of boys is = 515



CHECKING our Answer***

   3/5 = 309/515  

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