Question
There were 3 times as many girls as boys in the computer lab at first. After 5 girls left and 2 boys entered the computer lab, there were 13 more girls than boys remaining in the computer lab. What was the number of girls in the computer lab at first?
4 m

Click button first when a symbol is required. X

There were 3 times as many girls as boys in the computer lab at first. After 5 girls left and 2 boys entered the computer lab, there were 13 more girls than boys remaining in the computer lab. What was the number of girls in the computer lab at first?