Erin competes in track meets. She has won blue ribbons and red ribbons. For every 3 blue ribbons she has won, she has won 2 red ribbons. At this rate how many red ribbons will Erin have won after she has won 9 blue ribbons?

After winning 9 blue ribbons, Erin will have also won 6 red ribbons (2 red ribbons for every 3 blue ribbons).