A non-isotropic solid metal cube has coefficients of linear expansion as` 5 xx 10^(–5) //'^(@)C` along the x-axis and` 5 xx 10^(–6)//""^(@)C `along the y and the z-axis. If coefficient of volume expansion of the solid is `C xx 10^(–6) //""^(@)C` then the value of C is