Question
There were 4 times as many girls as boys in the gymnasium at first. After 11 girls left and 3 boys entered the gymnasium, there were 13 more girls than boys remaining in the gymnasium. What was the number of girls in the gymnasium at first?
4 m

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There were 4 times as many girls as boys in the gymnasium at first. After 11 girls left and 3 boys entered the gymnasium, there were 13 more girls than boys remaining in the gymnasium. What was the number of girls in the gymnasium at first?