SOLUTION: How many questions can I miss if there are 68 questions on my test and the test counts for 80% of my grade. Note: My GPA in the class is 88.9%. Anything below an 80 is failing

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Question 286204: How many questions can I miss if there are 68 questions on my test and the test counts for 80% of my grade.
Note: My GPA in the class is 88.9%. Anything below an 80 is failing (nursing course)
***I want to know how many questions i can miss to keep an 80% average for my class.***
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Each question on the test will count for 1%2F68 of 80% of your grade
1%2F68+=+.014706
.014706%2A80+=+1.176 (in percent)
88.9% of the remaining 20% of your grade is .889%2A20+=+17.78 (in percent)
Let n = number of questions you must answer CORRECTLY to
get a grade of 80% from the course
1.176n+%2B+17.78+=+80
1.176n+=+80+-+17.78
1.176n+=+62.22
n+=+52.91, or 53 out of 68, so you can miss 15 questions