beer math

When alcohol is bought at the store for a group of people by one person and there is a dispute over how much change should be returned. The receipt is then presented and the group does the beer math to determine the correct change to be given back.

Josh: Dude, where is my change at?

Adam: There is none. I used all the money you gave me.

Josh: There is no way a case of beer cost 20 bucks.

Michael: Guess we have to get the receipt out and do the beer math.

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