Question
The average cost of 3 colouring books is $50.
After a colouring book that costs $70 is removed,
  1. What is new total cost of all the remaining colouring books?
  2. What is new average cost of all the remaining colouring books?
3 m
(a)

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(b)

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The average cost of 3 colouring books is $50.
After a colouring book that costs $70 is removed,
  1. What is new total cost of all the remaining colouring books?
  2. What is new average cost of all the remaining colouring books?