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

Answer:

70 fiction books were added to the library .

Step-by-step 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  

Answer 2

Answer:

70 fiction books were added

Step-by-step 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