|    Later that night, we got a follow-up note from Dr. Wiggins:
   In the spirit of full disclosure, we already knew that. One of the benefits of being a math teacher is that you begin to build a mental file of all the brain teasers kids try to stump you with. After a while, you can make yourself incredibly obnoxious by blurting out the answers without hearing more than the first few words of the questions. Want to try it for yourself? Highlight the text between the arrows to check your answers.
   To be honest, we were kind of glad for the change in the problem. If the kids were hoping to impress their new friend, they'd have a much better chance of doing so by finding a solution that didn't already exist in their heads or on the Internet. As a result, we sent back this:
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