2015 AMC 12A Problem 3
Attempt Problem 3 of the 2015 AMC 12A 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 2015 AMC 12A solutions, or check the answer key.
All problems are used with official legal permission of the Mathematical Association of America (MAA).
3.
Mr. Patrick teaches math to students. He was grading tests and found that when he graded everyone’s test except Payton’s, the average grade for the class was After he graded Payton’s test, the class average became What was Payton’s score on the test?
Answer: E
Small hint:
The other students together scored
Big hint:
All scores together total ; subtract
Solution:
The sum of the other scores was The sum of all scores was
Therefore Payton’s score was
Thus, the correct answer is E.
Problem 3 in other years
- 1950 AMC 12
- 1951 AMC 12
- 1952 AMC 12
- 1953 AMC 12
- 1954 AMC 12
- 1955 AMC 12
- 1956 AMC 12
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- 1958 AMC 12
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