Bertha wears out 20 / 10 = <<20/10=2>>2 tennis balls in 20 games.
She loses 20 / 5 = <<20/5=4>>4 tennis balls in 20 games.
She buys canisters of 3 * 20 / 4 = <<3*20/4=15>>15 tennis balls in 20 games.
Bertha started with 2 balls and gave 1 away, so she has 2 + 15 - 2 - 4 - 1 = <<2+15-2-4-1=10>>10 tennis balls after twenty games.
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