Like one of those problems that ask; if a man buys three bottles of ginger beer, and saves $2.77 how much does each bottle cost and what kind of equation is this?  A quadratic perhaps?.  This nifty number conundrum seemed to be a test by the Shell Service Station in Davidson about altruism. Ginger beer was bought ( how could one resist), there was a discussion about the price,  bit of disgruntlement, and it was a good thing photo was taken pre-purchase because shortly after it got short shrift, or a quick rip.