Hey, GMAT beaters... Here is a riddle you could find in the GMAT: I made a cylindrical hole in a perfect sphere with an electric drill, and took out the two extremities of the sphere to get a nice napkin ring. Mum is very happy! Cut, my napkin ring is now 6cm high. :arrow: What is its volume ? The answer after your explanations ! Enjoy ! Ousek

Nice question, but don't we need the radius/diameter or any other information?

Your mom won't be proud of your low GMAT score because this is very dumb question...

ASS1991 wrote:Nice question, but don't we need the radius/diameter or any other information? No, there is no further information available ! Nevertheless, one can find the answer... PussInBoots wrote:Your mom won't be proud of your low GMAT score because this is very dumb question... A dumb question, yes, perhaps! But I wonder why you don't answer, in this case! I guess you should try an answer... :arrow: Come on guys, let's think about it...

https://en.wikipedia.org/wiki/Napkin_ring_problem I doubt it will be on the GMAT. However, for the curious, I've linked the idea behind this problem.

Neither do I. As far as I am concerned, I solved this problem in few minutes, even if I didn't have the knowledge explained in your link (thank you for it). Nevertheless, no question should require "few minutes". I just posted it because I believe it make people search... and the more a brain works, the faster it goes! Plus, I believe same of you here would have enjoyed such a riddle...

Is it 36pi? and I have a very very simple solution. Just imagine that the length you cut is almost equal to 0. In that case the diameter of the sphere will be 6 and the volume of the sphere is 4/3 * pi* 3^3 =36pi of course it took me more than 5 minutes to figure out this solution. and IMO it might not not be on GMAT or a question like this..but it is certainly not a "dumb" question