All of them - you'd fail, but the question did not say anything about passing the test!
87 and 30 is 117 wrong.
You can get 18 wrong.
He got 6 wrong.
You can get 60 questions wrong, which leaves you with 140 answers correct, giving you 70%.
39
You can get 20 questions wrong.
152 questions for California.
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.
http://dmvanswers.com/questions/297/How-many-questions-do-I-have-to-get-right-to-pass-drivers-permit-test
70% of 25 is 17.5. That is you will pass with 7 (7.5) questions wrong.
you can get 6 wrong. and you will have a 91% if u get more than that then u will be at an 89% (if the ?'s are not all worth the same amount u can get up to 6.5 wrong)