There are 9000 non-fiction books in the library.
represents the situation.
Step-by-step explanation:
Given,
Total books at library = 15000
Percent of non-fiction books = 60
Percent of all books = 100
Ratio of percent of books to non-fiction books = 100:60
Let,
x represent the number of non-fiction books.
Ratio of number of all books to non-fiction books = 15000:x
Using proportion
Ratio of percent of books :: Ratio of number of books

Product of extreme = Product of mean

Dividing both sides by 100

There are 9000 non-fiction books in the library.
represents the situation.
Keywords: ratio, proportion
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