The average cost of 6 books is $50.
After 2 books are removed,
the average cost of the remaining books is $30.
- 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 50
= $300
Number of remaining books
= 6 - 2
= 4
Total cost of the remaining books
= 4 x 30
= $120
Total cost of the 2 books that are removed
= 300 - 120
= $180
(b)
Average cost of the 2 books that are removed
= 180 ÷ 2
= $90
Answer(s): (a) $180; (b) $90