Suppose there are x pigs, then the chicken is x+20. According to the meaning of the question, we can get the equation:

4x+2(x+20)= 190

4x+2x+40= 190

6x= 150

x=25

25+20=45 (only)

Answer: 45 chickens and 25 pigs.

So the answer is: 45; 25.