Question 28
Let $XYZ$ be an equilateral triangle, and let $K, L, M$ be points on sides $XY, YZ, ZX$, respectively, such that $XK / KY = B$, $YL / LZ = 1 / C$, and $ZM / MX = 1$. Determine the ratio of the area of triangle $KLM$ to the area of triangle $XYZ$.