Answers and Explanation:
- Total of 80 point available.
- Each question is worth 5 points.
If he gets 7 questions wrong --> he loses 7 x 5 points = 35 points.
100 - 35 = 65 --> So, his score would be 65.
If he got x questions wrong --> he would lose 5x points.
So, his score would be 100 - 5x.
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