Information given:
Eric has 5 blue shirts
Eric has 9 red shirts
First, to find the total ratio, you must add all the shirts together
5+9=14
He has a total of 14 shirts
So the ration for blue shirts to the total is 5:14
The ratio for red shirts is 9:14
As stated, he has 5 blue and 9 red shirts
So the ratio of blue to red is 5:9