There are 250 books inside a library. On Tuesday, 120 books are taken out to be read by children. On Wednesday, 35 books are returned. On Thursday, another 15 books are withdrawn from the library. How many books are now in the library? Let's be accurate as possible.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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On Tuesday, 120 books were taken out 250 - 120 = 130 books. On Wednesday, 35 books were returned 130 + 35 = 165 books. On Thursday, 15 books were borrowed 165 - 15 = 150 books.
The answer: 150.