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This   is a Before After question.

LCM (left)

3/4 = 6/8

40/100 = 2/5 = 6/15

   Before    Tansfer  After      
Red    8u – 2u  6u  
Black   15u – 9u 6u  
White  8u – 32 – 24 8u – 60  
Total           20u – 60  

(8u – 60) / 1   = (20u – 60) / 4

32u – 240 = 20u – 60

32u – 20u = 240 – 60

12u = 180

1u = 180 ÷ 12 = 15

8u = 8 × 15 = 120 red

 

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