70% of 31 questions is 31*70/100 = 21.7 questions.
However, since you cannot have 0.7 questions, the answer is one of:
21 questions = 68% or 22 questions = 71%
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31% of 70= 31% * 70= 0.31 * 70= 21.7
You can get 60 questions wrong and get a 70 percent but if you get 61 wrong you are at a 69.5 percent.
14 of them.
30
You can miss 31.5 questions. 105*70%(.70)=73.5 105-73.5= 31.5