Help needed on a problem from the downloaded question set

Hi, Can anybody please solve this below question. I thought first of all the question was wrongly worded. Then replacing 80 with 80 %, I thought the answer is 159. 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...