弱弱地问一个文字题

norlanzhang · 发表于 2011-4-25 17:06:56

of all 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
请问为什么选择（E）？

alannesta · 发表于 2011-4-25 20:37:08

同问。。。如果凑得话是80* (50+65+90+50+110）/50
但是没怎么读懂。。

弱弱地问一个文字题

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