KöMaL 2007 K149
A square is divided into 30 triangles that do not overlap. Each side of the square is a side of a (different) triangle. The triangles meet at their vertices, that is, there is no vertex of a triangle lying in the interior of a side of another. How many vertices do the triangles have in the interior of the square altogether?
Official text KöMaL. Quoted with source.
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