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# Of the science books in a certain supply room, 50 are on

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Joined: 21 Aug 2003
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Of the science books in a certain supply room, 50 are on [#permalink]  30 Sep 2003, 20:42
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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 chemistry. If science books are removed randomly from the supply room, how many must be removed to ensure that 80 of the books removed are on the same science?
(A) 81
(B) 159
(C) 166
(D) 285
(E) 324
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Joined: 12 Sep 2003
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Location: Peru
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324.
You first take the books of the sciences with the fewest representation, this is 165, then you add 80 and 79, to get sure you've got 80 of any of these two sciences.
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