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Brain Teaser:
If an obelisk overlaps at a vertex with a second obelisk whose dimensions are two-thirds that of the larger obelisk, and that vertex is the apex of both obelisks, then what is the combined volume of the two obelisks, expressed as a function of the smaller obelisk’s individual volume?
Hint:
Obelisks were common in the architecture of ancient Egypt.
(Source: tabitha)
