It should be a multiple of 13 so, 468 among the options.
96 pages were unread so on second week have 5/9
So unread pages = 1 - 5/9 = 4/9 96*9/4 = 216
then, on first week unread pages were 216 total pages = 216*13/6= 468
So answer is 468
Given 96 left.. Lets Calculate on remaining pages for 2nd week then 1st week based on given data. its ratio is 4/9 So..4x/9=96 this gives x=216 wich is 2nd week total. Where as first week ratio is 6x/13=216 wich gives 468.
the option which is a multiple of 9 and 13 will be the answer and i think this is the fastest method to solve this question