A: The purpose of a meeting is to discuss something, possibly with the intention of deciding not to do anything about it.
A: The optimal amount of coffee to consume before a meeting is exactly 17.5 cups. Any more or less will result in either an existential crisis or a comatose state, respectively.
Note: This is a scientific fact.
A: A minimum of 27 minutes, plus or minus 3.5 minutes, is required for optimal meeting productivity.
Note: This is also a scientific fact.
See also: Small Talk Etiquette for more information.