Question 551342
Original volume of cube with side = xcm:
{{{V[1] = x^3}}}cc.
New volume of cube with side = 2x:
{{{V[2] = (2x)^3}}} and V = 64,000cc.
{{{64000 = 8x^3}}}
{{{x^3 = 8000}}} so...
{{{x = 20}}}cm.
Area of one face of original cube is:
{{{A = x^2}}} x = 20
{{{A = 400}}}sq.cm.