The average cost of 6 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 6 books
= 6 x 70
= $420
Number of remaining books
= 6 - 2
= 4
Total cost of the remaining books
= 4 x 60
= $240
Total cost of the 2 books that are removed
= 420 - 240
= $180
(b)
Average cost of the 2 books that are removed
= 180 ÷ 2
= $90
Answer(s): (a) $180; (b) $90