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Anonymous
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64% D+
%*amount=answer .15(15%) * x = 42 thefore 42/.15= x x=280
15% of 42 = 42*15/100 = 6.3
75% of 42 = .75 x 42 = 32 questions right; you can miss 42-32 = 10 questions to get a 75
42-15=27