Let number of books by astrid's = x
Out of x , 84% are fiction.
So, Number of non fictional books = x - [tex]\frac{84x}{100}[/tex]
= [tex]\frac{100x- 84 x}{100} = \frac{16x}{100}[/tex]
→Ratio of number of books to fictional books
[tex]=\frac{x}{\frac{84x}{100}}\\ = \frac{100}{84}\\= \frac{25}{21}[/tex]⇒[Dividing numerator and denominator by 4.]
→Out of 25 books by astrid 21 are fictional.
→ Number of fictional books by astrid = [tex]\frac{21}{25}[/tex]
