you can miss 40%
40 x .4 = 16
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64, of course. Unless you mean how many can you miss and still pass... 70% of 64 is 44.8, so you need 45 to pass so you can miss 19.
22 of them for a 75% pass rate providing that the remaining 66 questions are all correct
33
You can miss all of them, if you like! You will fail miserably, but you did not say you wanted to pass!
-- Take the percent you need to pass the test. If you don't know what that number is, ask the teacher. -- Subtract the passing number from 100 . -- Multiply the result by 0.9 . -- Now you have the number of questions you can miss and still pass the test. -- But only if all the ones that you do answer are correct!