Question 253744
r= one radius
R=other radius
v=one volume 
V=other volume


{{{volume of sphere=4/3*pi*r^3}}}
r+R=7
{{{r=7-R}}} and {{{v=4/3*pi*r^3}}} and {{{V=4/3*pi*(7-R)}}} and {{{v/V=64/27}}}
r = 4 units
   R = 3 units
  {{{v = (256 pi)/3}}},   {{{V = 36 pi}}}
  v=268.083 cubic units,   V=113.097 cubic units
surface area={{{4*pi*r^2}}}
{{{4*pi*4^2-4*pi*3^2}}} ={{{4*pi*(4^2-3^2)}}}={{{4*pi*(16-9)}}}={{{4*pi*7}}}={{{28*pi}}}=87.96 square units