There are 270 students at Colfax Middle School, where the ratio of boys to girls is 5:4. There are 180 students at Winthrop Middle School, where the ratio of boys to girls is 4:5. The two schools hold a dance and all students from both schools attend. What fraction of the students at the dance are girls?
Use the ratio and number of students to determine how many girls are there at Colfax Middle School.
Colfax 270 total student 5 boys 4 girls
---4 girls---/------ = x girls--------/-270 total student------