The electric field in a region is given by `vec(E)=E_(0)x hat(i)`. The charge contained inside

The electric field in a region is given by `vec(E)=E_(0)x hat(i)`. The charge contained inside a cubical volume bounded by the surface x=0, x=2m, y=0, y=2m, z=0 and z=2m is `n epsi_(0)E_(0)`. Find the va,ue of n.