2007 AMC 8 Problem 7
Attempt Problem 7 of the 2007 AMC 8 below, then check your answer against the professionally curated solution from LIVE by Po-Shen Loh. You can also try the full timed exam, view all 2007 AMC 8 solutions, or check the answer key.
All problems are used with official legal permission of the Mathematical Association of America (MAA).
7.
The average age of people in a room is years. An -year-old person leaves the room. What is the average age of the four remaining people?
Answer: D
Small hint:
Convert the original average into a total age.
Big hint:
Subtract the age of the person who leaves before dividing by the remaining number of people.
Solution:
Initially, the total age of everyone in the room is years.
After the person leaves, the total age is With people remaining, the average age becomes
Thus, D is the correct answer.
Problem 7 in other years
- 1985 AMC 8
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