TLS Online TPP Program

#Question id: 12878


The radii of two solid iron spheres are 1 cm and 6 cm respectively.A hollow sphere is made by melting the two spheres. If the external radius of the hollow sphere is 9 cm, then its thickness (in cm) is

#General Aptitude
  1. 2
  2. 1.5
  3. 0.5 
  4. 1