78 - 19 = 59 right answers
59/78 = .76 = 76%
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Well, honey, if you want a 78 percent on a test with 100 questions, you can get 22 questions wrong. That's just simple math, darling. So, make sure you don't mess up more than 22 times, or you'll be singing a different tune.
Divide how many questions you got right (11) by how many questions total there was (14). Then multiply it by 100. 11/14=0.78....... 0.78 x 100=78 YOUR ANSWER IS 78%
If you get 7 wrong you'll get 23/30 = 76.66... % Not enough. So fewer than 7. But that is provided that wrong answers score 0 and do not have penalties.
If the teacher is not using a curve, 33-7=26 so there are 26 questions right. The percent correct is 26/33 or 78.78787878 percent with the 78 in the decimal recurring, meaning this is a 78.8 or a 79, which is a C or a C+ in many grading systems.
Assuming each question is worth 1 mark, 78% of 32 = 78/100 × 32 = 24.96 As it is unlikely that you will get 0.96 of a question/mark, you will need to get 25 questions right to guarantee getting 78% - you will actually get 78⅛ % which would be rounded to 78% to the nearest whole percentage.