The average cost of 6 story books is $30.
After a story book that costs $60 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 30
= $180
New total cost of all the remaining story books
= 180 - 60
= $120
(b)
Number of remaining story books
= 6 - 1
= 5
New average cost of all the remaining story books
= 120 ÷ 5
= $24
Answer(s): (a) $120; (b) $24