SOLUTION: The volume of a sphere is numerically equal to twice its surface area. What is the radius of the sphere?

Question 1027010: The volume of a sphere is numerically equal to twice its surface area. What is the radius of the sphere?
Found 2 solutions by Alan3354, Fombitz:
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
The volume of a sphere is numerically equal to twice its surface area. What is the radius of the sphere?
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Solve for r.

Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
For a sphere,

So,

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