Of the science books in a certain supply room, 40 are on botany, 35 are on zoology, 30 are on physics, 40 are on geology, and 55 are on chemistry. If science books are removed randomly from the supply room, how many must be removed to ensure that 20 of the books removed are on the same science subject?
(1) 81 (2) 79 (3) 96 (4) 85 (5) 100
(1) 81 (2) 79 (3) 96 (4) 85 (5) 100
Watch this space for answer in a week.
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