Question 878453
{{{v=(4/3)pi*r^3}}} formula for volume of sphere.

Let r = radius of small sphere, and then 2r is the radius of the large sphere.


small sphere volume, {{{(4/3)pi*r^3}}}
larger sphere volume, {{{(4/3)pi(2r)^3}}}


Think through the ratio and the common factors, the larger sphere is {{{2^3=highlight(8)}}} times bigger than the smaller in volume.