Question
There were 4 times as many boys as girls in the canteen at first. After 12 boys left and 5 girls entered the canteen, there were 19 more boys than girls remaining in the canteen. What was the number of boys in the canteen at first?
4 m

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There were 4 times as many boys as girls in the canteen at first. After 12 boys left and 5 girls entered the canteen, there were 19 more boys than girls remaining in the canteen. What was the number of boys in the canteen at first?