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This is  Before After question. 

   Before Transfer   After 
Colour  3u  -16  3u – 16
Pattern     4u  -16  4u – 16

(3u – 16) / 1  = (4u -16)/ 4

12u – 64 = 4u  – 16

12u – 4u = 64 – 16

 8u = 48

1u = 48 ÷ 8 = 6

4u = 4 × 6 = 24 pattern socks

 

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