Question
There were 4 times as many girls as boys in the classroom at first. After 7 girls left and 10 boys entered the classroom, there were 19 more girls than boys remaining in the classroom. What was the number of girls in the classroom at first?
4 m

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There were 4 times as many girls as boys in the classroom at first. After 7 girls left and 10 boys entered the classroom, there were 19 more girls than boys remaining in the classroom. What was the number of girls in the classroom at first?