You can miss all of them, if you like! You will fail miserably, but you did not say you wanted to pass!
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3
20
Three 15 = 100% 1.5 = 10% 3 = 20% as a miss is 100% - 80% = 20%
22
Provided that all the ones that you do not miss are correct, then 30% of 90 = 90*30/100 = 27.