Question
There were 5 times as many boys as girls in the auditorium at first. After 4 boys left and 9 girls entered the auditorium, there were 19 more boys than girls remaining in the auditorium. What was the number of boys in the auditorium at first?
4 m

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There were 5 times as many boys as girls in the auditorium at first. After 4 boys left and 9 girls entered the auditorium, there were 19 more boys than girls remaining in the auditorium. What was the number of boys in the auditorium at first?