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8
90% of 80 right means 10% of 80 wrong, which means 10/100 x 80 = 1/10 x 80 = 1/1 x 8 = 8 questions wrong.
45.4545.. % wrong.
It is 6 correct, or 25% wrong.
6 out of 17 wrong in a math test means that the student got 11 out of 17 answers correct, which would be considered a 64.7% score.