${\mathrm{N}}_2{\mathrm{O}}_4$ is $10\%$ dissociated at a total pressure ${\mathrm{P}}_1$ and $20\%$ dissociated at a total pressure ${\mathrm{P}}_2$. Then ratio ${\mathrm{P}}_1/{\mathrm{P}}_2$ is

The values of ${\mathrm{K}}_{{\mathrm{p}}_1}$ and ${\mathrm{K}}_{{\mathrm{p}}_2}$ for the reactions   $\mathrm{X}\rightleftharpoons \mathrm{Y}+\mathrm{Z} .........\left(1\right)$, and  $\mathrm{A}\rightleftharpoons 2\mathrm{B} ........\left(2\right)$ are in the ratio of $9 : 1$. If the degree of dissociation of $\mathrm{X}$ and $\mathrm{A}$ be equal, then total pressure at equilibrium $\left(1\right)$ and $\left(2\right)$ are in the ratio