The average cost of 5 books is $30.
After 2 books are removed,
the average cost of the remaining books is $20.
- What is the total cost of the 2 books that are removed?
- What is the average cost of the 2 books that are removed?
(a)
Total cost of 5 books
= 5 x 30
= $150
Number of remaining books
= 5 - 2
= 3
Total cost of the remaining books
= 3 x 20
= $60
Total cost of the 2 books that are removed
= 150 - 60
= $90
(b)
Average cost of the 2 books that are removed
= 90 ÷ 2
= $45
Answer(s): (a) $90; (b) $45