Gwen's score in the music questions is 600
The given parameters are:
Trivia competition = -900
Grand total = -300
To determine Gwen's score in the music questions, we use the following equation
Trivia competition + Music = Grand total
This gives
-900 + Music = -300
Add 900 to both sides
Music = 600
Hence, Gwen's score in the music questions is 600
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