Mathematics · Averages
The average weight of some students in a section is 35.5 kg. Twelve of them whose average weight is 37 kg leave the section and another 5 students with weights 40 kg, 39.5 kg, 38.5 kg, 42 kg, and 47.5 kg join the section. As a result, the average weight of the students in the section increases by 300 g. The initial number of students in the section was:
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