Both the original coworker and I looked at her and said, "five."

Later in the evening, she asked me how that equation works. I tried, in vain, to explain that except in the cases of geometry and the straight arithmetic we were taught in elementary school, there are usually extenuating circumstances in the middle that tend to change the answer from what is expected. This reminded me of an old Sidney Harris cartoon from the New Yorker which has always been one of my favorites:

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