1972 AMC 12 Problem 12
Attempt Problem 12 of the 1972 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 1972 AMC 12 solutions, or check the answer key.
All problems are used with official legal permission of the Mathematical Association of America (MAA).
12.
The number of cubic feet in the volume of a cube is the same as the number of square inches in its surface area. The length of the edge expressed as a number of feet is:
Answer: B
Small hint:
If the edge is feet, its length in inches is
Big hint:
Equate the numerical values and
Solution:
Let the edge length be feet, or inches. The stated numerical equality is Since division by gives
Therefore, the correct answer is B.
Problem 12 in other years
- 1950 AMC 12
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