SOLUTION: I know how to find the percentage of something given the amount correct or wrong out of a total. I got a question though that I don't know how to approach. A person receives an

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Question 1031485: I know how to find the percentage of something given the amount correct or wrong out of a total. I got a question though that I don't know how to approach.
A person receives an 84% on a test. She answered 63 items correctly. How many items did she get wrong.
Can you give me a clue how to get started on this problem?
Found 2 solutions by Fombitz, rothauserc:
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
So then 63 items equals 84%.
Set up a ratio.
63 is to 84 as X is to 100.
63%2F84=X%2F100
X=6300%2F84
X=75

Answer by rothauserc(4718) About Me  (Show Source):
You can put this solution on YOUR website!
0.84 * x = 63
:
x = 63 / 0.84
:
x = 75
:
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there were 75 questions on the test
:
the person got 75 - 63 = 12 questions wrong
:
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