The average cost of 3 colouring books is $60.
After a colouring book that costs $80 is removed,
- What is new total cost of all the remaining colouring books?
- What is new average cost of all the remaining colouring books?
(a)
Total cost of 3 colouring books
= 3 x 60
= $180
New total cost of all the remaining colouring books
= 180 - 80
= $100
(b)
Number of remaining colouring books
= 3 - 1
= 2
New average cost of all the remaining colouring books
= 100 ÷ 2
= $50
Answer(s): (a) $100; (b) $50