题库搜索>问题求解PS-13298
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?
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12本书的总cost为12k,减去18再加上42为换上新书后的总Cost，然后在除以12为每本书的cost.就是(12k-18+42)/12 化简后是k+2
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