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Post new topic   Reply to topic    4GMAT - Online GMAT Preparation Forum Index -> GMAT Problem Solving
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grkmurthy
Senior Consultant


Joined: 14 Oct 2007
Posts: 37
PostPosted: Thu Nov 29, 2007 11:07 am    Post subject: Geometry Reply with quote
The volume of a sphere of radius r is obtained by the formula V = 4pi r^3/3. If the volume of a sphere is 972pi cubic inches, what is its radius in inches?

(1) 4
(2) 3
(3) 7
(4) 6
(5) 9
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ksvickram
Senior Consultant


Joined: 02 Jan 2008
Posts: 29
PostPosted: Mon Jan 07, 2008 6:07 pm    Post subject: Reply with quote
On solving this, we can get : r^3 = 3 ^ 6

Thus, r = 9 units.
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