How are these numbers calculated?

Big Games

How we did last week and who we should root for this week.   Explain

Week of 2/6100.0*Serie B100.0*Average seed
Botafogo 2 Gremio 5 +0.0
Week of 2/13100.0*Serie B100.0*Average seed
Santos 2 Coritiba 0 Yes
Goias 2 Botafogo 0 -0.0
Week of 2/20100.0*Serie B100.0*Average seed
Coritiba 0 Ceara 2 -0.0
Chance Will Win Championship