Uploaded September 2024 | Updated September 2026, 1 week ago

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Question: There are two kinds of students in a class, those who lie and those who do not. Each student knows which kind of student the other is. In a meeting today, each student tells what kind of student the other student is. The answer 'liar' is given 240 times. Yesterday a similar meeting happened with one student missing. The answer liar was given 216 times.
How many students are present today?

This series of videos is meant to be fun, challenging problems for those who like recreational math, problem solving, and puzzles.