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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.
Correct me if I'm wrong but I believe the answer to the question goes like the following: 27 floors (37 offices) = 999 offices in the building
65
Exactly as in the question: 27
Exactly as in the question 27