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Based on the survey results, 3 out of 80 patrons borrow novels.
To find out approximately how many out of 345 patrons borrow novels, we can set up a proportion:
3/80 = x/345
Cross multiplying, we get:
80x = 3 * 345
80x = 1035
x = 1035/80
x ≈ 12.94
Rounded to the nearest whole number, approximately 13 patrons out of 345 borrow novels when they visit the library.