Posted by **dan** on Thursday, April 15, 2010 at 3:09pm.

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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