DS， 一个company有teaching,researching,analysing3个project，researching 54%, analysing 46%， teaching30%, 问有多少percent的人至少参加2个project? 1) half of the teaching people at least participate in one of the researching and analysing project. 2) 20% of the analysing people also in researching. 条件一是不是说有15%的人属于tr+ta+tra呢？这道题答案是不是C呢？
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发表于 2011-8-9 17:33:31
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