Section 1. MEMBERSHIP; TERM. The general management, supervision and control of the public free schools of counties with a population of not less than eighty thousand (80,000) and not more than one hundred thirty thousand (130,000) according to the latest Federal Census, shall be vested in a County Board of Education. The County Board of Education shall be composed of seven (7) members to be elected at the District School Trustee Election on the 1st Saturday in April, one of whom shall be elected by the qualified voters from each Commissioner's Precinct, and three (3) from the county at large, by the qualified voters of the county. All of said members shall serve for a term of three (3) years; provided that in those counties not now having seven (7) trustees, the present County Board shall appoint two (2) trustees at large to serve for a period of three (3) years. The two (2) members who were elected on the 1st Saturday in April, 1930, shall serve until April 30, 1933, or until their successors are elected and qualified. On the 1st Saturday in April, 1931, at the District School Trustee Election five (5) County School Trustees shall be elected, two (2) from the Commissioner's Precinct whose terms expire in 1931 to serve until April 30, 1932, or until their successors are elected and qualified, and three (3) from the county at large, to serve for a period of three (3) years. Annually hereafter on the 1st Saturday in April either two (2) trustees or three (3) trustees, shall be elected for a term of three (3) years.