Question
The average cost of 7 guide books is $40.
After a guide book that costs $70 is removed,
  1. What is new total cost of all the remaining guide books?
  2. What is new average cost of all the remaining guide books?
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(a)

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(b)

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The average cost of 7 guide books is $40.
After a guide book that costs $70 is removed,
  1. What is new total cost of all the remaining guide books?
  2. What is new average cost of all the remaining guide books?