Question
21 children in a class sold an average of 20 cards for charity. There were 7 more boys than girls in the class. The average number of cards sold by the boys was 18. Find the average number of cards sold by the girls.
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21 children in a class sold an average of 20 cards for charity. There were 7 more boys than girls in the class. The average number of cards sold by the boys was 18. Find the average number of cards sold by the girls.