The average cost of 6 colouring books is $70.
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 70
= $420
New total cost of all the remaining colouring books
= 420 - 60
= $360
(b)
Number of remaining colouring books
= 6 - 1
= 5
New average cost of all the remaining colouring books
= 360 ÷ 5
= $72
Answer(s): (a) $360; (b) $72