19Meaning of " standard rateable value ".
(1)The standard rateable value for a county or large burgh for the purposes of the preceding provisions of this Part of this Act is the amount which bears to the weighted population of that county or large burgh for the year in question the same proportion as the sum which is to be taken for the purposes of subsection (1) of section three of this Act as the rateable value for England and Wales for that year increased by twenty-five per cent. bears to the aggregate of the weighted populations of all the counties and county boroughs in England and Wales for that year within the meaning of the said section three.
(2)In this section, the expression " the weighted population " in relation to a county or large burgh in Scotland means the population thereof plus the number of children under fifteen years of age therein and, in the case of a county the population whereof divided by the road-mileage thereof is less than seventy, plus also one-third of -the additional population needed in order that the population thereof divided by the road-mileage thereof should be seventy.