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To achieve a score of 90 on a 30-question test, you need to answer at least 27 questions correctly, as 90% of 30 is 27. This means you can miss up to 3 questions. Therefore, you can miss a maximum of 3 questions to still score 90.
If you want to pass the test, then you should study all ten questions. With only three questions on the test, missing one would give you a 67% score, and that is generally a fail - you don't want that - so study all ten questions.
62 questions, you just have to divide 48 by 3 and that is 14 and then you just add 14 to 48.
77 and 1/3%
It is: 30/35 or 85.714% to 3 decimal places providing all answered questions were correct