The plans for a shed call for a rectangular floor with a perimeter of 228 ft. the length is two times the width. what is the length and width? first, halve the 228 to give you one length and one width (as yet undetermined). this gives you the numb.... Solution: the plans for a shed call for a rectangular floor with a perimeter of 336 ft. the length is three times the widthh. find the length and width. algebra -> rectangles -> solution: the plans for a shed call for a rectangular floor with a perimeter of 336 ft. the length is three times the widthh. find the length and width.. Perimeter of a rectangle = 2*length + 2*width or p = 2l+2w the length is two times the width, or l = 2w combining the equations p= 2l+2w = 2*(2w)+2w = 6w 198 = 6w w = 198/6 = 33 ft l = 2w = 2*33 = 66 ft checking p = 2*66 + 2*33 = 132+66 = 198.