Find the number of small spheres of radius 2cm can be formed by melting a ball of iron of radius 4cm
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volume of big iron ball = 4/3 #r^3 = 4/3 x 22/7 x 64 cm^3
volume of small iron ball = 4/3 x 22/7 x 8 cm^3
No of small spheres = volume of big iron ball/ volume of small iron ball
= 64/8 = 8 balls
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