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If there were 12u cookies in the beginning, 6u cookies were sold and 6u cookies were left.

12u* 3/4 = 9u cookies   were chocolate and 3u were vanilla.

6u * 5/6 = 5u cookies sold were chocolate and  u sold were vanilla.

3u –  u = 2u  = 18

u = 9

9u – 5u = 4u = 36

36 chocolate cookies were not sold.

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