Anita has written a book of tips on staying healthy. Each book weighs 15 lb. If she packs 12 books in a box for shipping, what will be the shipping weight, excluding the box? Convert the answer to a mixed number.
The total weight of the books is 12 * 15 = <<12*15=180>>180 pounds.
The answer as a mixed number is 180/1 = <<180/1=180>>180. Answer: \boxed{180}.