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This is a Simultaneous equation. 

   R1  R2 R2 x 4 R1 – R2
Boys  100 25 100 0
Girls  100 20 80 20
Total 350 80   320 30

20g = 30

100g = 30 × 5 = 150

150 – 30 = 120 girls not participating 

 

 

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