Megan, I think you mean that they won 20 more than they lost. It is impossible to win more games than you play. 
# of wins = x + 20
# of losses = x
x + (x + 20) = 64 (total number of games)
2x + 20 = 64
2x = 44
x = 22
So the team lost 20 games and won (x + 20) = 22 + 20 = 42 games
 
     
             
 
                     
                    