85 = 100%
5 = x%
x = 5x100 ÷ 85
x = 5.88%
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20-3 = 17 and 17/20 = 85/100 = .85 or 85%. Percent is a ratio per cent or 100. Multiplying both the 20 and the 17 by 5 will make the denominator 100 and the percent sought after.
5% of 85 = 85/100 x 5= 0.85 x 5= 4.25
At most 16 questions. Percent means "out of 100" → 85% of 108 = 85/100 × 108 = 91 4/5 Which means unless you get 92 you will not get at least 85 % Therefore you can miss out on 108 - 92 = 16 questions at most and still get at least 85 %
percent is just another way of saying "out of 100". So 85% is 85 out of 100, or as a fraction 85/100. That can then be simplified by a factor of 5 to give 17/20.
(5/62)*100 = 8.07% wrong.