GMAT Problem Solving

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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

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