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OpenStudy (anonymous):
20% of what is 9? Jonas answered this question as shown. Explain his error and provide the correct solution
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OpenStudy (anonymous):
Let the unknown be x 20% of x = 9 Solve for x
OpenStudy (anonymous):
OpenStudy (anonymous):
OpenStudy (anonymous):
20% of x = 9 ("of " means multiply) .20x = 9 .20x/.20 = 9/.20 x = 45 check... (.20)(45) = 9 Jonas made the mistake of making 20% be equal to .02. When, in fact, 20% = .20.
OpenStudy (anonymous):
oops...I didn't finish checking... (.20)(45) = 9 9 = 9 (correct)
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