The average cost of 5 books is $70.
After 2 books are removed,
the average cost of the remaining books is $60.
- 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 70
= $350
Number of remaining books
= 5 - 2
= 3
Total cost of the remaining books
= 3 x 60
= $180
Total cost of the 2 books that are removed
= 350 - 180
= $170
(b)
Average cost of the 2 books that are removed
= 170 ÷ 2
= $85
Answer(s): (a) $170; (b) $85