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Source: GWD
Level: 0
The average (arithmetic mean) cost per book for the 12 books on a certain table is k dollars. If a book that costs 18 dollars is removed from the table and replaced by a book that costs 42 dollars, then in terms of k, what will be the average cost per book, in dollars, for the books on the table?
- A k + 2
- B k - 2
- C
- D
- E 12k - 6