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To find the approximate number of patrons who borrow novels, we can set up a proportion using the information given in the survey.
3 patrons borrow novels out of a sample of 80 patrons surveyed.
So, the proportion can be set up as:
3/80 = x/345
Cross multiplying, we get:
80x = 3 * 345
80x = 1035
x = 1035/80
x ≈ 12.94
Rounding to the nearest whole number, approximately 13 out of the 345 patrons borrow novels when they visit the library.