Question
There were 3 times as many boys as girls in the music room at first. After 9 boys left and 6 girls entered the music room, there were 9 more boys than girls remaining in the music room. What was the number of boys in the music room at first?
4 m

Click button first when a symbol is required. X

There were 3 times as many boys as girls in the music room at first. After 9 boys left and 6 girls entered the music room, there were 9 more boys than girls remaining in the music room. What was the number of boys in the music room at first?