Three capacitors of capacitances 25 μ F, 30 μ F and 45 μ F are connected in parallel to a supply of 100 V. Energy stored in the above combination is…

Three capacitors of capacitances $\displaystyle 25 \mu \mathrm{~F}, 30 \mu \mathrm{~F}$ and $\displaystyle 45 \mu \mathrm{~F}$ are connected in parallel to a supply of $\displaystyle 100$ V . Energy stored in the above combination is E . When these capacitors are connected in series to the same supply, the stored energy is $\displaystyle \frac{9}{x} \mathrm{E}$. The value of $\displaystyle x$ is $\displaystyle \_\_\_\_$.