If all the gold that has been produced in the last 500 years could be melted to form a single cube each side would measure about 16 meters How many cubic meters of gold is this?

The volume of a rectangular parallelepiped is length (L) times width (W) times height (H). V=LWH. For a cube, L=W=H = L3 so 16mX16mX16m=4096m3