# Brain Teaser

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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?

• Brain Teaser -

Professor Sum has 56 students.
28 of then study languages - one half
(14 of which study French)
8 study physics - one-seventh
20 do not study at all.

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