SOLUTION: If I have 51 Questions in a test, how do I figure out how many I can miss so that I at least get an 80%?

Question 935032: If I have 51 Questions in a test, how do I figure out how many I can miss so that I at least get an 80%?
Found 2 solutions by rfer, TimothyLamb:
Answer by rfer(16322) (Show Source): You can put this solution on YOUR website!
51*0.80=41
so you can miss 10
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
x = number of missed questions
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(51 - x)/51 * 100 <= 80
51 - x <= 80/100*51
-x <= 80/100*51 - 51
x <= 51 - 80/100*51
x <= 10.2
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answer:
you can't miss more than 10 questions
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