Question

Please give answer of 6 number​

Answer 1

7,500 books

Explanation:

Answer 2

`7,500`

Explanation:

Let's solve this problem step-by-step. The library had 1,500 books in 2011. The ratio of books in 2011 and in 2012 is 1:2. Therefore, let the number of books in 2012 be
`x`.

We have the following proportion:

`(1)/(1,500)=(2)/(x),\\x=2\cdot 1,500=3,000`

Therefore, there were 3,000 books in 2012. The ratio of books in 2012 and in 2013 is 2:5. Let the number of books in 2013 be
`y`.

We have:

`(2)/(3,000)=(5)/(y),\\2y=5\cdot 3,000,\\2y=15,000\\y=\boxed{7,500}`

Therefore, there were 7,500 books in 2013.