Section 12(2)(b) in The Maharashtra Zilla Parishads and Panchayat Samitis Act, 1961
(b)the seats to be reserved for the persons belonging to the Scheduled Castes and the Scheduled Tribes in a Zilla Parishad shall bear, as nearly as may be, the same proportion to the total number of seats to be filled in by direct election in that Zilla Parishad as the population of the Scheduled Castes or as the case may be, the Scheduled Tribes, in that Zilla Parishad area bears to the total population of that area and such seats shall be allotted by rotation to different electoral division in a Zilla Parishad; ]