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But just answering the original question ...
A common statistic is about 8,000 (8,333) sheets of copier-grade paper per tree. Newspaper-grade would yield about twice as much if it was cut into the same 8.5x11 size, so about 16,000 sheets.
How many paperback pages per sheet depends on the size of your paperback. Many paperbacks come in 7x4 size, and trade paperbacks are generally 8x5. To make calculations easy, lets assume that a page can be cut in half (8.5x5.5) to make an average paperback size. Since a page has both front and back, this means that 1 sheet is 4 paperback pages.
So, assuming that paperback paper is closer to newsprint, one tree is equivalent to 64,000 paperback pages. If your novel average is 250 pages, then one tree is equivalent to 256 books.
I am by no means an expert on printing -- all of these numbers came from quick google searches, and I didn't attempt to do any detailed verification. And these numbers relied on really gross approximations (how big is an average tree?). Furthermore, I tended to round down, for easy calculation.
I also agree with many of the earlier comments on tree farming, cost of transportation, cost of electronics in eink, electricity, etcetera.
However, I would guess that a round number would be between 250 to 300 books per 'tree'.
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