That explanation is not consistent with the claim You don't need math skills to solve this, only problem solving skills. I'm just saying, it'd be nice if ther

That explanation is not consistent with the claim You don't need math skills to solve this, only problem solving skills. I'm just saying, it'd be nice if there is a warning when something that looks like a standard lateral thinking brain teaser is actually the topic of a paper submitted by a pair of professors of mathematics to the 2003 Conference on "Compexity".