First you find out how many you got right by subtracting how many you got wrong from the total. So, 95-18 = 77
Then you divide the number correct by the total, so 77/95, which is about 81.1%
Then you apply the grading scale. In most cases, an 81.1% would be a low B.
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If you get 2 wrong out of 20 then its a 90 percent
You would get a 77%. You do 14 (the amount you got right) divided by the total amount of questions (18). So 14/18 which equals 0.77777777...
That is 75%
to get a 90 you need to answer 56 questions right (6 wrong) to get an 80 you need to answer 50 right (12 wrong) to get a 70 you need to answer 44 questions right (18 wrong) to get a 60 you need to answer 38 questions right (24 wrong)
If you answered 27 correctly and 18 incorrectly, you would have answered 60% correctly.