Linus is hanging the drywall on the wall he just built. Each sheet of drywall is 6 ft. by 8
ft. and the studs of the wall are placed every 1.5 ft. If he hangs the drywall lengthwise
and puts a drywall screw every 1 ft. along each stud, how many screws will he use to
hang the sheet of drywall?