Brain Teaser
posted by dan .
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. Onehalf of them study languages only,
onefourth of them study French, oneseventh of them study physics only, and 20 do not study at
all.” How many students does Professor Sum have?

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