The Oatmeal has a hilarious collection of things we should have learned in school, but my favorite is the math lesson above. After all, we've all been in that frustrating situation before.
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Bistro Math. They use it to power inter-stellar travel in one of the later Hitchhiker's Guide books :)
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The correct answer is "seperate checks", let the wait staff do the math.
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Alas, I live in Ohio. The last time that I wrote down an integral in public, I was asked if it was music. I am lucky that I wasn't burned for witchcraft.
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