Your final exam is worth 30% of your grade, and you already have a 66 in the class. The test is 45 questions. You have to make an 80 on the exam to pass the class. How many questions can be missed on the exam to make an 80.

80-66=14% is the remaining % required to pass the class.but the final exam contributes 30%; hence

number of questions to get right is (30x)/45=14

x=(14*45)/30

x=21 questions are required to get an 80.

45-21=24 questions can be missed to make an 80

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