1953 AMC 12 Problem 11
Attempt Problem 11 of the 1953 AMC 12 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 1953 AMC 12 solutions, or check the answer key.
All problems are used with official legal permission of the Mathematical Association of America (MAA).
11.
A running track is the ring formed by two concentric circles. It is feet wide. The circumferences of the two circles differ by about:
feet
feet
feet
feet
none of these
Answer: C
Small hint:
The outer radius is feet greater than the inner radius
Big hint:
Subtract the circumferences; the unknown inner radius cancels
Solution:
If the inner radius is the difference is feet, which is about feet.
Thus, the correct answer is C.
Problem 11 in other years
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