Question
The average cost of 6 books is $60.
After 4 books are removed,
the average cost of the remaining books is $30.
  1. What is the total cost of the 4 books that are removed?
  2. What is the average cost of the 4 books that are removed?
3 m
(a)

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(b)

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The average cost of 6 books is $60.
After 4 books are removed,
the average cost of the remaining books is $30.
  1. What is the total cost of the 4 books that are removed?
  2. What is the average cost of the 4 books that are removed?