Question

twenty seven spheres of radius 'r' were melted and one new sphere was formed. what is the radius of this sphere?

Answer 1

radius of larger circle is 3r

Answer 2

volume of 27 spheres = 4/3$\pi$r³
volume of one big sphere = volume of 27 spheres
27(4/3$\pi$r³)=4/3$\pi$R³
27r³=R³
3r=R
THE RADIUS OF NEW SPHERE IS 3 the radius of old sphere