How many balls of radius 4 cm can be made from a solid sphere of lead of radius 8cm?
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volume of solid sphere of radius 8 = total volume of solid balls of radius 4 = n * volume of solid balls of radius 4 {where n is number of balls}
4/3*pi*8^3 = n*4/3*pi*4^3
n= (8^3)/4^3 = 8
number of balls =8
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