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This is a Before and After question. 

   Before  Transfer  After   
Boys    18 -1u 18 – 1u  
Girls 12   12  
Total 30      

30 × 60/100 = 18

(18 – 1u) / 2 = 12 / 8

144 – 8u = 24

144 – 24 = 8u

8u = 120

1u = 120 ÷ 8 = 15 boys

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