A school has two varsity basketball teams. One is the girls' team, and the other is the boys' team. On any given Saturday in December, the probability that the girls' team will have a game is 0.8, and the probability that the boys' team will have a game is 0.7. The probability that both teams have games is 0.65.

On any given Saturday in December, what is the probability that either the girls' team or the boys' team has a game?