Linda read 1/5 of a book on Friday and 2/7 of the book on Saturday. On Sunday she read 5/9 of the remaining pages. What fraction of the book did she read

Here, you just want to solve it by finding a common denominator.

1/5+2/7, because she read 1/5 and 2/7 of the book on separate days. The common denominator is 35.

7/35+10/35

=17/35

So that's how much of the book she read before Saturday.

Now it says that on Sunday she read 5/9 of the remaining pages, meaning:

1-17/35 should give us our answer

35/35-17/35=18/35

But since it says she read 5/9 of the remaining pages, we need to multiply 18/35 by 5/9 to get what 5/9ths of 18/35 is.

(18/35) (5/9) = 2/7

Therefore she read 2/7ths of the book on Sunday.