Of the science books in a certain supply room, 40 are on botany, 55 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 area science?  Choose the most appropriate option.
A) 187 B) 256 C) 282 D) 304 E) 331
The worst case scenario is to remove all the books on botany, zoology, and geology.   Also we can remove 79 books each from physics and chemistry.   The total is  40 + 55 + 50 + 79 + 79= 
<gadget id="calculator"> 40 + 55 + 50 + 79 + 79</gadget>
<output>303</output>
303.   The next book removed must either be physics or chemistry, ensuring 80 books in that subject.   The answer is 304.
<result>D</result>
Of the science books in a certain supply room, 40 are on botany, 55 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 area science?