The value of the surface area (in square centimeters) of the cone is equal to the value of the volume (in cubic centimeters) of
the cone. The formula for the surface area S of a right cone is S=πr2+πrl, where r is the radius of the base and l is the slant height. Find the height of the cone.
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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 =