Question

school library had 1500 books in the year 2011 in 2012 the number of books increased in the ratio of 1 : 2 in 2013 the number of books further increase in the ratio of 2 :5 find the number of books in the year of 2013

Answer 1

Ratio of books in 2011 : 2012 = 1 : 2 (Given)

Find the number of books in 2012:

Number of books in 2011 = 1500 (Given)

Let x be the constant ratio:

Ratio of books in 2011 : 2012 = 1x : 2x

1x = 1500

2x = 1500 x 2 = 3000

Find the number of books in 2013:

Ratio of books in 2012 : 2013 = 2 : 5

Let x be the constant ratio:

Ratio of books in 2012 : 2013 = 2x : 5x

2x = 3000 (found earlier)

x = 1500

5x = 1500 x 5 = 7500 books

Answer: There are 7500 books in 2013