SECTION 9A. Establishment of class

Upon application of twenty or more residents of any city or town who are eighteen years of age or over certifying that they desire to attend a class for instruction of the type described in section nine, the school committee of such city or town shall establish and cause to be conducted such a class or classes for a period of not less than forty sessions; provided, that, in case the attendance of any such class falls below fifteen, such school committee may discontinue such class.