Dielectrics in capacitors

In the above diagram, there are three capacitors P, Q and R with their respective distinct dielectric materials. The dielectric constant and the thickness of the dielectric material for P, Q and R are (2κ,d),(κ,2d)(2\kappa, d), (\kappa, 2d) and (3κ,3d),(3\kappa, 3d), respectively. Let CP,C_P, CQC_Q and CRC_R denote the electric capacities of the three capacitors, respectively, then what is the ratio CP:CQ:CR?C_P:C_Q:C_R?

The plate areas of the three capacitors are the same.

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