“’Unsolvable’ exam question leaves Chinese students flummoxed”
▻http://www.bbc.com/news/world-asia-china-42857864
It might seem unfair at first but this is exactly the type of question that is sorely lacking in formal education, certainly not just in China. Asking for exactness alone has at least two bad side-effects: 1) students will think there’s always one correct answer, 2) that a quick, rough approximation is not a good answer. This is the opposite of the real world.