1993 AMC 8 Problem 15
Attempt Problem 15 of the 1993 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 1993 AMC 8 solutions, or check the answer key.
All problems are used with official legal permission of the Mathematical Association of America (MAA).
15.
The arithmetic mean (average) of four numbers is If the largest of these numbers is then the mean of the remaining three numbers is
Answer: A
Small hint:
The four numbers sum to
Big hint:
Subtract the largest number, then divide the remaining sum by
Solution:
The four numbers sum to so the remaining three sum to
Their mean is
Thus, the correct answer is A .
Problem 15 in other years
- 1985 AMC 8
- 1986 AMC 8
- 1987 AMC 8
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- 1989 AMC 8
- 1990 AMC 8
- 1991 AMC 8
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