1950 AMC 12 Problem 34
Attempt Problem 34 of the 1950 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 1950 AMC 12 solutions, or check the answer key.
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34.
When the circumference of a toy balloon is increased from inches to inches, the radius is increased by:
in
in
in
in
in
Answer: D
Small hint:
Use for each circumference
Big hint:
The change in circumference is times the change in radius
Solution:
Because the changes satisfy Hence the radius increases by inches.
Thus, the correct answer is D.