Dielectrics question from JEE Main 2013 (25 Apr, Shift 1)

A parallel plate capacitor having a separation between the plates d, plate area A and material with dielectric constant K has capacitance $C_0$. Now one-third of the material is replaced by another material with dielectric constant 2K, so that effectively there are two capacitors one with area $\frac{1}{3}$ A, dielectric constant 2K and another with area $\frac{2}{3}$ A and dielectric constant K. If the capacitance of this new capacitor is C then $\frac{C}{C_0}$ is