Question 1074790
Starting with 20 gallons
5 G red
6 G yellow
9 G green.
That is how much of each color is in the 20 gallons.
Add 4 gallons to each
9G red
10 G yellow
13 G green
Now have 32 gallons total 
Red is 9/32 or 28.12%
Yellow is 10/32 or 31.25%
Green is 13/32 or 40.63%