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To estimate how many patrons borrow novels, we can use the proportion of patrons surveyed who borrowed novels.
Proportion of patrons surveyed who borrow novels = 3/40
Now we can use this proportion to estimate the number of patrons out of 345 who borrow novels:
Number of patrons who borrow novels = (3/40) * 345 ≈ 25.875
Rounded to the nearest whole number, approximately 26 patrons out of the 345 patrons in the local library borrow novels when they visit the library.