The average cost of 7 books is $70.
After 2 books are removed,
the average cost of the remaining books is $50.
- 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 7 books
= 7 x 70
= $490
Number of remaining books
= 7 - 2
= 5
Total cost of the remaining books
= 5 x 50
= $250
Total cost of the 2 books that are removed
= 490 - 250
= $240
(b)
Average cost of the 2 books that are removed
= 240 ÷ 2
= $120
Answer(s): (a) $240; (b) $120