It would depend on the question.
Assuming that the questions have the same value, each one is worth 1.47 % of the maximum possible score.
25
To calculate your grade, you need to know how much each question is worth. If each question is worth the same, you can divide the number of correct answers (80 - 3 = 77) by the total number of questions (80) and multiply by 100 to get a percentage. If each question is worth different points, you'll need to know the point value of each question to calculate your grade.
I cannot answer this question. I do not know how much each question is worth.
It would depend on the question.
I12000
Depends on the test.
Assuming that the questions have the same value, each one is worth 1.47 % of the maximum possible score.
If you make the assumption - without any justification - that all questions are worth the same, then each one is worth 1/35 of the total for the exam.
8 and 1/3%
It would be a 73, depending on how much each question was worth.
Assuming each question has the same number of marks, 1 question is worth 1.6666...% 100 divided by 60 = 1.66666666... However it is much more likely, especially if the test is in preperation for exams, that each question will be worth a different amount depending on the hardness of the question and how much detail/work needs to be put in to get the right answer, 1.66666...% is more an average of how much each question is worth, than how much each question is actually worth.
16.6 with a line above the six after the decimal.
If each question has the same "weight" (value), then each question would be worth 100% / 40 = 2.5%. However, it is also possible that some questions have more weight than others. In this case, 2.5% is simply the average value of each question.
25
To calculate your grade, you need to know how much each question is worth. If each question is worth the same, you can divide the number of correct answers (80 - 3 = 77) by the total number of questions (80) and multiply by 100 to get a percentage. If each question is worth different points, you'll need to know the point value of each question to calculate your grade.