8 more red circles because if you have 9 red circles and 3 blue ones the ratio would be 9:3 and if you simplify that down to 3:1 that’s the answer. So you would need to add 8 more red circles
Mean=np 36=(0.12)n n=300 300 students were surveyed. That's the way I answer in my country but I'm not sure about this solution is correct in your school or not.
