14 of them.
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 can get 63 questions wrong and get 70%.
30
70% of 25 is 17.5. That is you will pass with 7 (7.5) questions wrong.
24 wrong answers
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 can get 63 questions wrong and get 70%.
30
You can get 18 wrong.
70% of 25 is 17.5. That is you will pass with 7 (7.5) questions wrong.
You can get 60 questions wrong, which leaves you with 140 answers correct, giving you 70%.
24 wrong answers
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 score 70% or higher you must get at least 70/100 * 70 = 49 questions right. So you can get 70 - 49 = 21 questions wrong, but no more!
30/100*25 =7.5 so you must not get more than 7 questions wrong to score 70%
If you miss 28 questions out of 70, your score would be 60%
Provided that all 150 exam questions are weighted equally, then 105 correct responses is 70%.