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August 29, 2014

Homework Help: math

Posted by james on Tuesday, December 8, 2009 at 8:37am.

When Professor Sum was asked by Mr. Little how many students were in his classes, he answered, “All of them study either languages, physics, or not at all. One-half of them study languages only, one-fourth of them study French, one-seventh of them study physics only, and 20 do not study at all.” How many students does Professor Sum have?

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