All right, I downloaded it, but I'm highly suspicious of both the title and your description. "It sounds like you and the book are trying to trick me into doing math," she said cautiously as she eyed the file dubiously.
But, I never pass up an opportunity to find a math stumper to sic my husband onto... he gets can't admit failure and walk away... I get to watch him puzzle it out... math is a spectator sport for me.
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