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This is  Matrix question. 

LCM 

Girls = 7/7 × 2/5 = 14/35

Boys = 3/7 = 15/35

   Play    No    total   
Girls  14u         21u       35u
Boys  15u   15u
  29u   50u

29/50 × 100% = 58%

 

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Thanks to all

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Hope this answers your question.

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