100 - 69 = 31, and it's percent, so it's .31
.31*30 = 9.3, but you must round down or up (down to get more than 69%), so you can miss 9 questions and still fail.
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29/30 questions correct = 96.6667 percent, which is exactly 96 2/3%
Nine.
you can miss 12 questions 30 right = 30/42 = 71%
If you miss five questions out of 30, your score is a 83.33%
60%