The average cost of 3 colouring books is $50.
After a colouring book that costs $70 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 50
= $150
New total cost of all the remaining colouring books
= 150 - 70
= $80
(b)
Number of remaining colouring books
= 3 - 1
= 2
New average cost of all the remaining colouring books
= 80 ÷ 2
= $40
Answer(s): (a) $80; (b) $40