Given sequence of numbers ${\mathrm{X}}_1,{\mathrm{X}}_2,{\mathrm{x}}_3,\dots \dots {\mathrm{X}}_{2005}$which satisfy, $\frac{{\mathrm{x}}_1}{{\mathrm{x}}_1+1}=\frac{{\mathrm{x}}_2}{{\mathrm{x}}_2+3}=\frac{{\mathrm{x}}_3}{{\mathrm{x}}_3+5}\dots \dots \frac{{\mathrm{x}}_{2005}}{{\mathrm{x}}_{2005}+2009}\text{ where }{\mathrm{x}}_1+{\mathrm{x}}_2+\dots \dots .{\mathrm{x}}_{1005}=2010\text{ then }\frac{1005}{164}{\mathrm{x}}_{21}$ is