Question

in a public library, there are 220000 books, 40% of which are Science books. It was decided to add 40,000 new bookstore to library.
How many of the new books should be Science books in order to bring the percentage of Science booles in the library up to
45%?​

Answer 1

Answer:

A public library is a library that is accessible by the general public and is usually funded from public sources, such as taxes. It is operated by librarians and library paraprofessionals, who are also civil servants.

Answer 2

Answer: 29,000

1) Number of science books:

40/100 x 220,000 = 88,000

So, we know that the library had 88,000 science books.

Then 40,000 books are added

2) 220,000 + 40,000 = 260,000

Now we will need a new calculation to see how many books would equal to 45% of the library (science books)  

3) 45/100 x 260,000 = 117,000

This shows that to get 45%, we need 117,000 books.

Now we need to see how many new books to add:

4) 117,000 - 88,000 = 29,000