Question

This means there were 500 books in a school library. 70% of these were fiction books. Some new books were added to the library

the afternoon. As a result, the number of fiction books increased by
20% and the number or non-fiction books increased to 80% of the books in the
library. How many fiction books were added to the library this afternoon?​

Answer 1

70 fiction books were added

Explanation:

Total number of books

= 500

Fiction books

= 70% of the total books

= 0.7 x 500

= 350

Increase in Fiction books

= 20% of the total fiction books

= 0.2 x 350

= 70

Answer 2

70 fiction books were added to the library .

Explanation:

there were 500 books.

70% of these were fiction books.

so,

fiction books were =(500 x 70/100)

=350

now,

these were 350 fiction books

Some new books were added to the library . As a result, the number of fiction books increased by 20%.

so,

the number of fiction books were added =350 x 20%

=350 x 20/100

=70