Question

A solid metal cylinder of radius 14 cm
and height 21 cm is melted down and
recast into spheres of radius 3.5 cm.
So the number of spheres that can
be made is :
​

Answer 1

Answer:

The ans is 72

Step-by-step explanation:

for getting the no of spheres we just have to divide the volume of cylinder by volume of sphere i.e vol of cylinder/vol of sphere

The vol of cylinder =pi*r^2*h (r is the radius nd h is height)

The vol of sphere =4/3*pi*r^3

=(22/7*14*14*21)/(4/3*22/7*3.5*3.5*3.5

=22/7*14*14*21*3/4*7/22*1/3.5*1/3.5*1/3.5

=72