Thank you for coming to Brainly with your questions!
I believe the answer is:
7:2. I found this by setting up the ratio 28:8. We have to simplify this ratio, and the greatest common factor (GCF) is 4, so divide both sides by 4, and you get 7:2.
I hope this helps you! Please mark Brainliest! Lemme know if I can help you with any further questions!
-Belle