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Of the science books in a certain supply room, 50 are on [#permalink]
26 Feb 2006, 09:40
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?