25 points with a minimum 2 points advantage.
In effect, this question is unanswerable. The reason, is due to two unknowns 1) the final score of each team and 2) the winning team must have a two point advantage over its opponent !
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the volleyball game is over at 21 points. However no team can win by only one point. This makes longer games take more points to win. You need to be two points ahead.