SOLUTION: if I took a test and answered 80 questions and received a 95% on my test how many questions did I answer incorrectly

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Question 984685: if I took a test and answered 80 questions and received a 95% on my test how many questions did I answer incorrectly

Found 4 solutions by vleith, macston, rothauserc, MathTherapy:
Answer by vleith(2983)   (Show Source): You can put this solution on YOUR website!
The total number of questions is 80. You got a 95%. SO that says you got 95% correct


That means you missed 4
Answer by macston(5194)   (Show Source): You can put this solution on YOUR website!
.
80 is 95% of (80/0.95=)84.2
If there were 84 questions on the test, you answered 4 wrong.
Answer by rothauserc(4718)   (Show Source): You can put this solution on YOUR website!
we setup the following ratios
x / 100 = 80 / 95
x = (100*80) / 95 = 8000 / 95 = 84.210526316
x = 84
therefore
84 - 80 = 4
I answered 4 questions incorrectly
Answer by MathTherapy(10557)   (Show Source): You can put this solution on YOUR website!

if I took a test and answered 80 questions and received a 95% on my test how many questions did I answer incorrectly 
Let number of incorrect answers be I

Then number of correct answers = 80 - I



This gives us: 

 ------- Cross-multiplying





Incorrect answers, or , or  

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