43 days are required on average to read 5 pages daily.
Given that the total number of pages is 300 and Tom has read 85 pages this means he has 300-85=215 pages unread. We are told that if he reads 5 pages per day how many days would he be done with the 215 pages left.
To solve for the number of days left, we have to divide 215 by 5
= 215 / 5
= 43 days
So Tom needs 43 days to read the 215 pages left and return the book to the Library.
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