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The key to this question is to realize that the total number of boys AND girls (children) does not change. 

 

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This is a Before After question. 

       Before   Transfer   After  
Girls    4u – 8 4u – 8     
Boys 1u + 8 1u + 8
Total 5u    

(4u – 8) / 2 = (1u + 8) / 1

4u – 8 = 2u + 16

4u – 2u = 16 + 8

2u = 24

1u = 24 ÷ 2 = 12

5u = 12 × 5 = 60 

 

 

 

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