1.

A metallic solid cylinder of height 1 metre and diameter15cm has been melted and recast in to spheres each of diameter 5cm . how many such spheres will be obtained

Answer»

Volume of metallic cylinder=pi*R*r*h
22/7*100*7.5*7.5=123750/7cm^3
no.of spheres*volume of 1 sphere=volume of cylinder
y*4/3*pi*r*r*r=pi*r*r*h
y*4/3*2.5*2.5*2.5*22/7=123750/7
y=123750*7*3/4*22*2.5*2.5*2.5
y=270
therefore, no.of spheres is 270


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