Question

An iron sphere of radius 5cm is melted and smaller spheres each of radius 2.5cm are made.how many smaller spheres are obtained ​

Answer 1

Answer:8

Step-by-step explanation:

Radius of big sphere = 5cm

Volume of big sphere = 4/3πr^3

Volume 1 = 4/3*22/7*5cm*5cm*5cm

Radius of small sphere = 2.5cm

Volume2 = 4/3*22/7*2.5cm*2.5cm*2.5cm

No of spheres = volume1/volume2

=4/3*22/7*5cm*5cm*5cm / 4/3*22/7*2.5cm*2.5cm*2.5cm

No of spheres =125cm^3/15.625cm^3

No.of spheres = 8