A structural steel beam supports a roof that weighs 20 psf. An analysis of the loads has the following: S=12 psf, L_r=18 psf and W=38 psf (upwards) or 16 psf (downwards). If the beams are spaced 6ft 0 in apart, determine the factored uniformly distributed loads per foot (upward and downward, if appropriate) by which each beam should be designed.