A circle with a radius of 4 feet is cut from a piece of

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A circle with a radius of 4 feet is cut from a piece of sheet metal with uniform thickness. The circle weighs 20 pounds. If another circle is cut from the same sheet and weighs 60 pounds, then its radius is closest to which of the following?

A. 6 feet
B. 7 feet
C. 8 feet
D. 9 feet
E. 10 feet

[spoiler]OA=B[/spoiler]

Source: Manhattan GMAT
Source: — Problem Solving |