I think it depends on the grading scale. However, if each was worth a point then maybe you could only miss 15 questions to get an 85%.
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Three 15 = 100% 1.5 = 10% 3 = 20% as a miss is 100% - 80% = 20%
100%-80%=20%10*.2=2Therefore you missed 2 questions.
The answer to how many questions you can miss (assuming each question is worth 1 mark) is given below: ((100-90)/100) * 125 = 12.5 questions. You must round this down unless you can be awarded half marks. Assuming no half marks are awarded you can miss up to 12 questions on a 125 question test and score 90% or more.
You can miss out 30% 30% of 150 = 150*30/100 = 45
20