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.)
Nine.
To achieve an 80 percent score on a 75-question test, you need to answer at least 60 questions correctly (since 80% of 75 is 60). This means you can get a maximum of 15 questions wrong (75 total questions - 60 correct answers = 15 wrong).
To achieve an 87 percent score on a 125-question test, you need to correctly answer 87 percent of the questions. This means you need to answer 109 questions correctly (0.87 x 125 = 108.75, rounded up). Therefore, you can get 16 questions wrong (125 - 109 = 16).
To achieve a 70 percent score on a 49-question test, you need to correctly answer at least 34.3 questions. Since you can't answer a fraction of a question, you need to round up to 35 correct answers. Therefore, you can get a maximum of 14 questions wrong (49 - 35 = 14).
45.4545.. % wrong.
You can get 60 questions wrong and get a 70 percent but if you get 61 wrong you are at a 69.5 percent.
You could fail seven questions, and still meet the minimum mark required.
Each question is worth 2.5 percent. You can get 8 wrong.
69 questions
Nine.
20
22 questions can be wrong. This means that you would have to get 33 marks, which is 60%
10 can be wrong and 30 right; 30/40 = 75%
To achieve a 70 percent score on a 49-question test, you need to correctly answer at least 34.3 questions. Since you can't answer a fraction of a question, you need to round up to 35 correct answers. Therefore, you can get a maximum of 14 questions wrong (49 - 35 = 14).
45.4545.. % wrong.
40% were wrong.
You can get 20 questions wrong.