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    				| 1. | 
                                    A cylinder made of metal has radius 18 cm and height 40 cm. When this melts how many cylinders can be made of radius 2 cm and height 5 cm? | 
                            
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Answer»  Volume of the first cylinder = π r2 H = π (18)2 × 40 = 12960 π cm3 Volume of the newly made cylinder = π (2)2 × 5 = 20π cm3 Number of the new fly made cylinders = \(\frac{12360\pi}{20\pi}\) = 648 cylindres  | 
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