Question 768344
Volume of sphere = {{{(4/3) pir^3}}}

Volume of cylinder = {{{ pi * r^2*h}}}


Ratio of volumes = {{{((4/3) pi*r^3)/(pi * r^2*h)}}}

But h=2r

Ratio = {{{((4/3) pi*r^3)/(pi * r^2*(2r))}}}


=  {{{ (4/3) /2}}}

={{{2/3}}}