Heat And Thermodynamics

A rigid diatomic gas $\left(\gamma = \dfrac{7}{5}\right)$ is compressed adiabatically to volume $\left(\dfrac{V_i}{32}\right)$, where $V_i$ is the initial volume. The initial temperature of the gas is '$T_i$' K and the final temperature is '$x\,T_i$' K. The value of $x$ is