Answer:
,
,
, 
Step-by-step explanation:
The bag has a total of (4+2+3+5) = 14 balls. Set up the proportions:
Red: 
green: 
yellow: 
blue: 
Now solve!
Removing 1 yellow, 1 red, 1 green, and 1 blue = 
Removing 1 blue, 1 green, 1 green, and 1 yellow = 
Removing 1 red, 1 red, 1 yellow, and 1 yellow = 
Removing 1 green, 1 yellow, 1 yellow, and 1 red = 