Since 1901, the Washington Senators have smashed their most home runs with 100+ RBIs and a batting average of .300 or above in a season in 1930, with 57 home runs.

most hr in a season by twin with at least 100 rbi and a.300 batting average since 1901
Interpreted as:
most hr in a season by twin with at least 100 rbi and a.300 or higher batting average since 1901

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