Question
There were some children in the auditorium. After 10 boys left the auditorium and 13 girls entered the auditorium, there were 145 children in the auditorium. How many children were there in the auditorium at first?
2 m

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There were some children in the auditorium. After 10 boys left the auditorium and 13 girls entered the auditorium, there were 145 children in the auditorium. How many children were there in the auditorium at first?