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To achieve a score of 70% on a 300-question test, you would need to answer 210 questions correctly. To find out how many questions you can miss, subtract the number of correct answers from the total number of questions: 300 - 210 = 90. Therefore, you can miss up to 90 questions on a 300-question test and still achieve a score of 70%.
you can't answer the question if you don't know how many total questions there are
15 5 point questions and 30 2 point questions.
You cannot know that. If you are told the total number of points for the test, you know (or count) the number of questions and you are told that each question is worth the same number of points then, and only then, each question is worth (total points/number of questions) points.