Mathematics, 20.08.2021 17:20, akiib

A bookshop has some fiction and non books. 2/5 of the books are fiction books. Of these, 1/5 are mystery stories. 1/3 of the non fiction books are mystery stories too. What fraction of all the books in the shop are mystery books?

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A bookshop has some fiction and non books. 2/5 of the books are fiction books. Of these, 1/5 are mys...