The average cost of 3 story books is $70.
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 3 story books
= 3 x 70
= $210
New total cost of all the remaining story books
= 210 - 60
= $150
(b)
Number of remaining story books
= 3 - 1
= 2
New average cost of all the remaining story books
= 150 ÷ 2
= $75
Answer(s): (a) $150; (b) $75