Question
There were 4 times as many boys as girls in the computer lab at first. After 11 boys left and 8 girls entered the computer lab, there were 5 more boys than girls remaining in the computer lab. What was the number of boys in the computer lab at first?
4 m

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There were 4 times as many boys as girls in the computer lab at first. After 11 boys left and 8 girls entered the computer lab, there were 5 more boys than girls remaining in the computer lab. What was the number of boys in the computer lab at first?