20/30 = 66.666...%, which is a D in most grading systems, but not necessarily.
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75%, a solid C
90% still good :D
If there are 10 questions on the test then they are each worth 10 point to make a total of 100. If you miss one question, then you got 9 right (10 - 1 = 9) so 9 times 10 would be a grade of 90.
If there are 10 questions, then each question will be worth 10 points to make a total grade of 100. Therefore, if you got 6 questions correct (10 - 4 = 6) then your grade will be a 60 (6 times 10)
66.6