As many as you want to, up to all of them. Past a certain point, though,
you'll be given a failing score on the test.
Only 20
There are 20 questions
30 questions. 6 wrong=fail
You can get 20 questions wrong.
5
It depends on how many questions there are.
5
14 of them.
30
no more than 7
37 questions wrong gives you a 70.2% correct.
70% of 25 is 17.5. That is you will pass with 7 (7.5) questions wrong.