Answer based on context:

In July, after being off for a month, he played in 21 games and hit .494 (42–85), raising his season average to .390. Brett started a 30-game hitting streak on July 18, which lasted until he went 0–3 on August 19 (the following night he went 3-for-3). During these 30 games Brett hit .467 (57–122). His high mark for the season came a week later, when Bretts batting average was at .407 on August 26, after he went 5-for-5 on a Tuesday night in Milwaukee Brewers. He batted .430 for the month of August (30 games), and his season average was at .403 with five weeks to go. For the three hot months of June, July, and August 1980, George Brett played in 60 American League games and hit .459 (111–242), most of it after a return from a monthlong injury. For these 60 games he had 69 RBIs and 14 home runs.

How many more games were played during his hitting spree than were played June, July and August 1980?
30