In a math contest, there are 25 questions, one of which gets 5 points for doing it right and 3 points for doing it wrong. Tucki scored 93 points and Tucki scored 93 points.
Solution: Set the correct question X, and the wrong question is (25-x). According to the meaning of the question, there are
x×5+(25-x)×(-3)=93
Solve, get
5x-75+3x=93
8x= 168
x=2 1
∴ 25-x=25-2 1=4
A: I got 2 1 right and 4 wrong.
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