87 and 30 is 117 wrong.
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x/30 = 1-0.87= .13 x = 30 x .13 = 4 questions wrong 26 question right = 26/30 =.87 = 87% right
87% of 46 = 0.87 * 46 = 40.02.Assuming you can only score whole marks then you will need to score 41 out of 46 to be certain (although 40 out of 46 would also be rounded up to 87 as the nearest whole percentage, which might be done.)
(84 -11)/84 = 73/84 = .87 Grade is an 87, or B+
30%
87.5% of 30= 87.5% * 30= 0.875 * 30= 26.25