how many solid spheres of diameter=6cm are required to be melted to form a solid metal cylinder of height=45cm and diameter=4cm?

 radius  (  R ) of cylinder = 2cm 

height of cylinder = 45cm

radius  ( r  ) of  sphere = 3 cm

No of solid shperes = volume of cylinder / volume of sphere 

                                    = pi R2 h / 4/3 pi r

                                   =  2 2  * 45 / 4/ 3 * 3 3

                                  = 4 * 45 / 4 / 3 * 27 9

                                 = 4 * 45 9 / 4 *

                                 = 5  

So the no. of solid sppheres be 5 .

thumbz up plz !!!

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Thank you.....

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its 15

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