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Question 863449: Judy made 84% on her last math test. If she missed 4 problems, how many questions were on the test?
Answer by jim_thompson5910(35256)   (Show Source):
You can put this solution on YOUR website! Let x = number of questions on the test
She missed 4 questions, so she got x-4 questions correct.
84% of (number of questions on test) = number of correct answers
0.84x = x - 4
0.84x-x = -4
-0.16x = -4
x = -4/(-0.16)
x = 25
So there are 25 questions total on the test. She missed 4 of them, so she got 25-21 = 24 questions correct. Notice how 21/25 = 0.84 ---> 0.84*100 = 84%
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