53 percent is considered a failing grade.
80
A or 80 %
23/30 = .7666 = 76.66% = C
67% or D+
That would be 85% (30 divided by 35) which is normally a grade of B. If you only missed 3, you would have an A-.
30% F
It would be a 70%. Just do 21/30 on your calculator.
80
As a percentage it is: 83.33%
70% is usually a C-
A or 80 %
23/30 = .7666 = 76.66% = C
56.7% or F
I would say 13-16
you would have a 94
You score 90%. Your grade will depend on the grade boundaries determined by the testing organisation and any other normalisation.
You would be either a sophomore or a junior in high school, depending on when your birthday is.