Question

How many spherical balls each of radius 1cm made from a solid sphere of lead of radius 4cm.

Answer 1

Increasing the radius by any factor x increases the volume by a factor of x^3. 
[That's x cubed, if you aren't familiar with the local convention for writing exponents.] 

In this case, the factor x=8, 
so the volume of the sphere of radius 8 is 
8^3 = 512 times the volume of a sphere of radius 1.

Thus, it takes 512 balls [answer d] to make the sphere.

Answer 2

Answer:

Step-by-step explanation:

no. of balls =(volume of big sphere)/(volume of small sphere)

=(4/3πR^3)/(4/3πr3)

=(3^3)/(1^3)

=27/1

=27

hence,27balls are made from big sphere