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工作学习 / English / NEW GMAT QUESTION: Of the science books in a certain supply room, 50 are on botany, 65 are on zoology, 90 are on physics, 50 are on geology, and 110 are on chemistryIf science books are removed randomly from the supply room, how many should be removed to ensure that 80 of the books removed are on the same science?
1.81 2.159 3.166 4.285 5.324
-labelle(桃谷小仙);
2002-10-25
{188}
(#816924@0)
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the more, the better. 5
-windnorth(塞外风);
2002-10-25
(#816946@0)
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要ensure就要考虑最坏的情况，解答见内：只有physics和chemistry可能被拿到80本，因为其他都少于80。因此最坏的情况是：
50 botany、65 zoology、50 geology，然后拿了79本physics或chemistry，最后再拿80本另外一种的。
因此：50+65+50+79+80=324
选5
-jqian(Q_Q);
2002-10-25
{198}
(#816980@0)
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小仙同志应该加强逻辑思维的训练，GMAT的这种逻辑比起GRE来差多了。
-jqian(Q_Q);
2002-10-25
(#816983@0)
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是是,没摸着门呢,郁闷!
-labelle(桃谷小仙);
2002-10-25
(#817278@0)