Question 956887
You start with {{{V=16*9=144}}}{{{m^3}}} of sand in the container.
You mention that some of it was transferred.
I assume that it completely fills the 4m side cube.
The volume of the cube is,
{{{V[c]=4*4*4=64}}}{{{cm^3}}}
So the amount of sand remaining is,
{{{V[r]=144-64}}}
{{{V[r]=80}}}{{{m^3}}}
The base of the container stays the same only the height changes.
{{{16*H=80}}}
{{{H=80/16}}}
{{{H=5}}}{{{m}}}