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The average weight of a class of 25 students is 30 kg. The average weight of the girls is 5 kg more than that of the boys. If the class teacher’s weight, which is between 64 kg and 106 kg, is included, the average weight of the male members of the class equals that of the female members. If the average weight of the boys (in kg) is an integer, then what is the number of girls in the class?