10
69 questions
20
22 questions can be wrong. This means that you would have to get 33 marks, which is 60%
7 wrong out of 22 questions = 31.8% wrong. 15 correct out of 22 questions = 68.2% correct. I hope it wasn't a math test.
10 can be wrong and 30 right; 30/40 = 75%
69 questions
Nine.
39
45.4545.. % wrong.
40% were wrong.
20
22 questions can be wrong. This means that you would have to get 33 marks, which is 60%
7 wrong out of 22 questions = 31.8% wrong. 15 correct out of 22 questions = 68.2% correct. I hope it wasn't a math test.
10 can be wrong and 30 right; 30/40 = 75%
In order to score exactly 70% on a test with exactly 70 questions ... if every questionis worth the same credit ... you have to get 21answers wrong. You can do it.
To achieve 80 percent on a 40-question test, you need to answer at least 32 questions correctly (80% of 40 is 32). This means you can only get 8 questions wrong (40 - 32 = 8). Therefore, to score 80 percent, you can afford to miss a maximum of 8 questions.
30/100*25 =7.5 so you must not get more than 7 questions wrong to score 70%