Question

The+volume+of+the+two+spheres+is+in+the+ratio+64:+27+.+Find+the+difference+of+their+surface+areas,+if+the+sum+of+their+radii+is+7.

Answer 1

Answer:

Ratio of vols=64:27

Ratio of radii =3 v64:3v27

= 4:3

SA's

1) 4 πr 2 = 64π

2) 4πr2. = 36π

Diff=64 π-36π = 28πunit 2

=87.92 unit 2

Sum of radii ratio = 4+3=7