A balloon filled with Helium and air is designed to support a mass of 106kg (payload+ empty balloon) and the mass of gases which fill it.Air density is 1.29kg/m^3, Helium plus air density in the balloon is 0.247kg/m^3, and Helium density is 0.179kg/m^3. Ignoring the volume of the payload, find the volume of the balloon.