What fraction of the book did she read on Sunday?

Question

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.

Answer 1

Since we know the answer in terms of the amount of remaining pages, we first need to calculate how much of the book remains.  This can be calculated as follows:

 

1/5 + 2/7 = (7+2*5)/35 = 17/35.  Therefore, on Sunday the remaining pages is 1- 17/35 or 18/35.  5/9 of 18/35 is 2/7, so Linda read 2/7 of the book on Sunday.