In a 15-question test, each correct answer was worth 3 points and, for each mistake, you lost 2 points. João answered all the questions and totaled...
In a 15-question test, each correct answer was worth 3 points and, for each mistake, you lost 2 points. João answered all the questions and totaled 30 points. How many questions did he get wrong?
A) 3.
B) 4.
C) 6.
D) 12.
A) 3.
B) 4.
C) 6.
D) 12.
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