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Maths, Addmaths and Statistics: Post your doubts here!

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Why do guys have to argue on the slightest of excuse? -.-

Kamihus, my question is absolutely relevant and I am looking forward for a quick solution. :rolleyes:
http://papers.xtremepapers.com/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_s05_qp_2.pdf
Q-7 d)
Total volume is 500 cm^3 as mentioned above.
Radius of inner is r and outer is r+1.5.
Apply the formula pi*r^2*h for volume of cylinder.
Subtract the volume of inner from outer.
Make an equation and you get 6pi*r^2 twice (positive and negative). Solve the rest of the equation and you get 8.09
 
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