In the given figure the total charge stored in the combination of capacitors is  $200\mu C.$ The value of $\text{'}x\text{'}$  is _________.

Charge on $C_1$ is  $Q_1=2\times 20=40\mu C\mathrm{......}\left(i\right)$

$\begin{array}{l}{\text{charge\hspace{0.17em}\hspace{0.17em}on\hspace{0.17em}C}}_2\text{\hspace{0.17em}is}\\ {\text{Q}}_2=X\times 10=20X\mu C\mathrm{......}\left(ii\right)\end{array}$

$\begin{array}{l}\text{Charge\hspace{0.17em}\hspace{0.17em}on\hspace{0.17em}}{C}_{3}is{Q}_3=3\times 20=60\mu C\mathrm{........}\left(iii\right)\\ \text{Total\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}charge 40+20X+60=200}\\ 20X=100\\ X=5\end{array}$