Based on her recipe, Elena knows that 8 servings of
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Let number of books by astrid's = x
Out of x , 84% are fiction.
So, Number of non fictional books = x -
=
→Ratio of number of books to fictional books
⇒[Dividing numerator and denominator by 4.]
→Out of 25 books by astrid 21 are fictional.
→ Number of fictional books by astrid =