[問題]考古題Form 35-16

[shena]

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 books 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

Ans:(E)

請問這題該如何解?

[liwuu]

這一題好像是OG裡面也有的題目(原諒我半年多沒碰OG了...)
題目問要保證搬出來的書中有80本是相同的science
50+65+79+50+79=323
此時再多一本,不論是physics或chemistry都可以達到題目要求
所以323+1=324