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Draw out the model : 1u = 1box

 

Equal number of boys & girls in hall: 

Boys: 18u (remain) + 12u (left hall) = 30u

Girls: 25u (remain) + 5u (left hall) = 30u 

 

12u – 5u = 21 

7u = 21

u = 3

 

Number of pupils remaining in hall = 18u + 25u = 43u = 129

 

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Thank you very much for the answer!😁

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