Answer:
50 Students
You can find the number of boys and girls by dividing the total, so there are a total of 20 boys and 30 girls in the choir of 50. The ratio 2 boys : 3 girls means we can divide the chorus into groups.
The independent variable is the type of material the balls are made from
All you do is divide.
330/390= 0.846
round it: 0.85
Answer is about 85%
