The average cost of 3 textbooks is $70.
After a textbook that costs $60 is removed,
- What is new total cost of all the remaining textbooks?
- What is new average cost of all the remaining textbooks?
(a)
Total cost of 3 textbooks
= 3 x 70
= $210
New total cost of all the remaining textbooks
= 210 - 60
= $150
(b)
Number of remaining textbooks
= 3 - 1
= 2
New average cost of all the remaining textbooks
= 150 ÷ 2
= $75
Answer(s): (a) $150; (b) $75