Question 193536
First find the volume in a square pyramid.
http://www.mathsteacher.com.au/year10/ch14_measurement/25_pyramid/21pyramid.htm
{{{V[p] = l^2*h /3}}}
{{{V[p] = 771^2 * 486 / 3 }}}
{{{V[p] = 96299442}}} cubic feet

Next find the volume in one cube shaped apartment
{{{V[a] = l * w * h }}}
{{{V[a] = 35 * 20 * 8}}}
{{{v[a] = 5600 }}} cubic feet

Now see how times larger in volume the pyramid is compared to the apartment
{{{TimesBiggerInVolume = V[p] /V[a]}}}
{{{TimesBigger = 96299442 /5600 }}} 
{{{TimesBigger = 17183.83 }}} 
So the volume of 17183 complete apartments fits in there.