The average cost of 6 colouring books is $40.
After a colouring book that costs $60 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 6 colouring books
= 6 x 40
= $240
New total cost of all the remaining colouring books
= 240 - 60
= $180
(b)
Number of remaining colouring books
= 6 - 1
= 5
New average cost of all the remaining colouring books
= 180 ÷ 5
= $36
Answer(s): (a) $180; (b) $36