The average cost of 6 books is $90.
After 2 books are removed,
the average cost of the remaining books is $40.
- 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 6 books
= 6 x 90
= $540
Number of remaining books
= 6 - 2
= 4
Total cost of the remaining books
= 4 x 40
= $160
Total cost of the 2 books that are removed
= 540 - 160
= $380
(b)
Average cost of the 2 books that are removed
= 380 ÷ 2
= $190
Answer(s): (a) $380; (b) $190