The students in Class $A$ and Class $B$ are selling candies The students in Class $A$ are divided into $3$ groups, while the students in Class $B$ are divided into $4$ groups. Given that each group in Class $A$ sold $12$ candies on average and each group in both Class $A$ and Class $B$ sold $8$ candies on average, how many candies did each group in Class $B$ sold on average? 
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