Ashelf at a bookstore displays 27 books. of these 27 books, 9 of the book are nonfiction books. the store owner add 6 new fiction books to the shelf and wants the ratio of fiction books to nonfiction books to remain the same. what is the total number of nonfiction books that the store should display, after the new fiction books are added?

distance covered by pamela in 9 l of fuel = 99km

let us apply unitary method here.

distance covered by pamela in 1 l of fuel =99/9 =11 km

now let us find distance covered by pamela if she has 12 l of fuel.

distance covered in 12 l = distance covered in 1 l of fuel * 12

we know that distance covered by here in 1 l is 11 km.

so distance covered in 12 l of fuel = 11*12 = 132 km.