The number of wins that the team recorded is 21
The number of losses is 6
Odds are the combinations of the event that you want divided by the event of it not hapenning
The events that we want are wins = 21
the events that we don't want(That don't go in our favor) = 6
Thus,
Odds = P(win)/P(loss)
P(win) = 21/(21 + 6) = 21/27
P(loss) = 6/(21 + 6) = 6/27
odds in favor = (21/27) / (6/27)
odds in favor = 21/27 x 27/6 = 21/6
odds in favour = 3.5