13 wrong out of 85 is 72 correct.
So percentage score = 100*72/85 = 84.7%
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If u get 1-5 wrong A 5-10 wrong B 10-15 wrong C 15-20 wrong D 20 and up u get a F
If by grade you mean percentage, you would have scored 67.5%. 40-13= 27 (27/40) * 100
4 out of 13 wrong = 9 out of 13 correct = 69.2% .We sincerely hope it wasn't a math test.
Well, honey, if you got 4 wrong out of 17 questions, you'd have 13 correct. So, you take your correct answers, divide by the total questions, multiply by 100, and voila, you've got yourself a grade. Math doesn't lie, darling.
2 wrong out of 13 means 11 right out of 13 11/13 = 84.6% This typically translates to a solid B on many, if not most, grading scales. At Hogwarts it would probably be an A (Acceptable) - or possibly E (Exceeds Expectations) YMMV