1987 AMC 8 Problem 9
Attempt Problem 9 of the 1987 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 1987 AMC 8 solutions, or check the answer key.
All problems are used with official legal permission of the Mathematical Association of America (MAA).
9.
When finding the sum
what is the least common denominator used?
Answer: C
Small hint:
The least common denominator is the least common multiple of
Big hint:
Use to cover the factor (and ), then include and
Solution:
The least common multiple must include and (the factor is already covered).
So it is
Thus, the correct answer is C .
Problem 9 in other years
- 1985 AMC 8
- 1986 AMC 8
- 1988 AMC 8
- 1989 AMC 8
- 1990 AMC 8
- 1991 AMC 8
- 1992 AMC 8
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