Petra's test

The answer will be given 8 marks, and the wrong answer will be deducted 3 marks. The total number of marks obtained by the school is 36. If Petra answered six questions correctly,   how many questions were answered incorrectly by the student from the school?

Correct answer:

x =  4

Step-by-step explanation:

8 63 x=36  3x=12  x=4=4



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