x/84 = 0.70
x = 59 right; that means 84-59 = 25 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
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
Two of them.