SOLUTION: 1/3 scored 90. 1/3 had a passing score. What fraction of the class failed?

Question 888781: 1/3 scored 90. 1/3 had a passing score. What fraction of the class failed?

Found 2 solutions by stanbon, richwmiller:
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
1/3 scored 90. 1/3 had a passing score. What fraction of the class failed?
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Sounds like 1/3 failed.
Cheers,
Stan H.
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Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
It seems like 1/3 failed but actually 2/3 failed. Those who passed all scored 90.
1/3 scored 90 and the 1/3 who had a passing score were the same 1/3.

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