Matt is hanging drywall on the wall he just built. Each sheet of drywall is 4ft. by 4ft., and the studs of the wall are placed every 2ft. If Matt hangs the drywall lengthwise and puts a drywall screw every 1ft. along each stud, how many screws will he use to hang one sheet of drywall?         24 screws          16 screws          12 screws          8 screws

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