The average cost of 6 story books is $40.
After a story book that costs $70 is removed,
- What is new total cost of all the remaining story books?
- What is new average cost of all the remaining story books?
(a)
Total cost of 6 story books
= 6 x 40
= $240
New total cost of all the remaining story books
= 240 - 70
= $170
(b)
Number of remaining story books
= 6 - 1
= 5
New average cost of all the remaining story books
= 170 ÷ 5
= $34
Answer(s): (a) $170; (b) $34