Question
There were 4 times as many boys as girls in the auditorium at first. After 7 boys left and 4 girls entered the auditorium, there were 25 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 4 times as many boys as girls in the auditorium at first. After 7 boys left and 4 girls entered the auditorium, there were 25 more boys than girls remaining in the auditorium. What was the number of boys in the auditorium at first?