50. If 18, a, b, -3 are in AP, then a+b is equal to
(1 Point)
19
7.
11
15
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In a library 20% of books are in english, 33.33% is in german and the remaining books are in french. among the german books, 75% are fiction books and the rest are non-fiction. among the non-fiction books,10% are biographies, 20% are autobiographies and the rest are books on society, arts, and culture. among the autobiographies, there are 20 books written by women which comprise 40% of autobiographical novels. how many books are there in the library in total?
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