In a certain collection of books there are 30 books in hard cover that contain more than 100 pages. If 15 percent of the books that contain more than 100 pages are in hard cover, how many books contain more than 100 pages but are not in hard cover?
total hard cover books> 100 pages = 30
let total books>100 pages=x
hence 200-30=170 =no. of books>100 pages but no hard cover
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