Question

How many balls each of radius 2 cm can be made by melting a big ball whose radius is 8 cm?

Answer 1

hye
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The radius of the larger ball is 4 times that of the smaller ball (8 cm / 2 cm = 4) 

the volume of the larger sphere will be 4^3 times as big as the sphere is 3 dimensional 

=>4 x 4 x 4 = 64 

So if you melt down the larger sphere you can make 64 of the smaller spheres.
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hope it helps
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Answer 2

hi
number of balls can be made=volume of larger ball/volume of smaller ball
                                              =4/3*22/7*8*8*8/4/3*22/7*2*2*2
                                              =64 balls can be made


hope it helps
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