Posted by **Zach** on Thursday, November 5, 2009 at 11:04pm.

Mary's class took two tests last week. 80% of the class passed the math test, 90% of the class passed the English test, and 72% of the class passed both. What is the probablility that a randomly selected student in Mary's class failed both tests? Express your answer as a percent rounded to the nearest tenth of a percent?

Thanks

-Zach

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