Answer :
If the ratio of the posters' perimeter is 4:5 and the larger one is 85 inches, then we may want to know how much is one "part" of the ratio - so we divide 85 by 5:
85 / 5 = 17
So the larger poster is 5 * 17 = 85, and the smaller one is 4 * 17 = 68.
85 / 5 = 17
So the larger poster is 5 * 17 = 85, and the smaller one is 4 * 17 = 68.
