Two of them.
You can get 18 wrong.
39
Nine.
You can get 60 questions wrong, which leaves you with 140 answers correct, giving you 70%.
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).
You can get 20 questions 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.
Each question is worth 2.5 percent. You can get 8 wrong.
5
14 of them.
30
50
You can get 18 wrong.
69 questions
70% of 25 is 17.5. That is you will pass with 7 (7.5) questions wrong.
39
Nine.