A property management firm is buying parcels of land in order to build a small community of condominiums. It has just bought three adjacent plots of land. The first is four-fifths of an acre, the
second is five-twelfths of an acre, and the third is nineteen-twentieths of an acre. The firm knows
that it must allow one-sixth of an acre for utilities and a small access road. How much of the
remaining land is available for development?